Cherry picks: r301243, r300531, r300571.
Plus a local patch to link with libunwind when rtlib=compiler-rt

chromiumos-sdk test run with llvm-next is clean https://uberchromegw.corp.google.com/i/chromiumos.tryserver/builders/chromiumos-sdk/builds/2202 

Another cherry pick: r300583

Also picked r301505 to disable GVNHoist pass (https://buganizer.corp.google.com/issues/37718617).

The following revision refers to this bug:
  https://chromium.googlesource.com/chromiumos/overlays/chromiumos-overlay/+/fd00fa4043be5bff16ff3c48066f59f4246ec6c2

commit fd00fa4043be5bff16ff3c48066f59f4246ec6c2
Author: Manoj Gupta <manojgupta@google.com>
Date: Thu Apr 27 18:15:45 2017

Update llvm/clang to r300080.

Rebase llvm/clang compiler to r300080.
Includes cherrypicks: r300571, r300531, r300583, r301243.

llvm-next now tracks current google3 stable r301047.

BUG= chromium:714983 
TEST= The performance and stability of target boards is good.
https://dashboards.corp.google.com/google::_27e80daf_9a51_4369_9b98_4e31f1f87ae4
https://uberchromegw.corp.google.com/i/chromiumos.tryserver/builders/llvm_next_toolchain

TEST=Chromiumos-sdk test job passed.
https://uberchromegw.corp.google.com/i/chromiumos.tryserver/builders/chromiumos-sdk/builds/2202

Change-Id: I21ca2c1136a687e42998eff0bfb1ba2f0af6d454
Reviewed-on: https://chromium-review.googlesource.com/488321
Commit-Ready: Manoj Gupta <manojgupta@chromium.org>
Tested-by: Manoj Gupta <manojgupta@chromium.org>
Reviewed-by: Ting-Yuan Huang <laszio@chromium.org>

[rename] https://crrev.com/fd00fa4043be5bff16ff3c48066f59f4246ec6c2/sys-devel/clang/clang-5.0_pre300080.ebuild
[delete] https://crrev.com/76a02c832b623b811fe508e238fd4e2ab85d1914/sys-devel/llvm/files/cherry/d6168b6ed57fe78bf42f57509d73bde2680105b5.patch
[add] https://crrev.com/fd00fa4043be5bff16ff3c48066f59f4246ec6c2/sys-devel/llvm/files/cherry/bde56a96995a329cf1df5716b1f84b32aac6c174.patch
[delete] https://crrev.com/76a02c832b623b811fe508e238fd4e2ab85d1914/sys-devel/llvm/files/cherry/6300980dd120ee39c6acb1449269a01e892ed3c7.patch
[add] https://crrev.com/fd00fa4043be5bff16ff3c48066f59f4246ec6c2/sys-libs/compiler-rt/files/cherry/385d9f6d5abb6b2d4ea27e59ac1e7b0e20d54f7c.patch
[delete] https://crrev.com/76a02c832b623b811fe508e238fd4e2ab85d1914/sys-devel/llvm/files/cherry/80ea0f28fb5be3e632b0ae712823c28715f3bbe7.patch
[modify] https://crrev.com/fd00fa4043be5bff16ff3c48066f59f4246ec6c2/profiles/targets/chromeos/package.mask
[delete] https://crrev.com/76a02c832b623b811fe508e238fd4e2ab85d1914/sys-devel/llvm/files/cherry/88948ad1d3271c40709bd931b1822b5710aa3e9f.patch
[delete] https://crrev.com/76a02c832b623b811fe508e238fd4e2ab85d1914/sys-devel/llvm/files/cherry/06f9b86145451df76f74540867ea0d1671e41d20.patch
[delete] https://crrev.com/76a02c832b623b811fe508e238fd4e2ab85d1914/sys-devel/llvm/files/cherry/4c434043b9a5140cf6ab9231c82e6000bb6f31f6.patch
[delete] https://crrev.com/76a02c832b623b811fe508e238fd4e2ab85d1914/sys-devel/llvm/files/cherry/15e919d001037b85218dbf135ccc9522f91a86e1.patch
[add] https://crrev.com/fd00fa4043be5bff16ff3c48066f59f4246ec6c2/sys-libs/compiler-rt/files/clang-4.0-asan-default-path.patch
[delete] https://crrev.com/76a02c832b623b811fe508e238fd4e2ab85d1914/sys-devel/llvm/files/cherry/242e37443552dd128bb35e9f500e05d7d6f4afed.patch
[rename] https://crrev.com/fd00fa4043be5bff16ff3c48066f59f4246ec6c2/sys-libs/llvm-libunwind/llvm-libunwind-5.0_pre300080.ebuild
[delete] https://crrev.com/76a02c832b623b811fe508e238fd4e2ab85d1914/sys-devel/llvm/files/cherry/38ab2af2b57bc9390bb9b695001cba63b9262f2b.patch
[delete] https://crrev.com/76a02c832b623b811fe508e238fd4e2ab85d1914/sys-devel/llvm/files/cherry/e604e8210fa49cfe23fb262e228d40734eaed141.patch
[add] https://crrev.com/fd00fa4043be5bff16ff3c48066f59f4246ec6c2/sys-devel/llvm/files/llvm-next-leak-whitelist.patch
[delete] https://crrev.com/76a02c832b623b811fe508e238fd4e2ab85d1914/sys-devel/llvm/files/cherry/133b0bceea54f061d2a4739a4cf93dcc0ece2879.patch
[delete] https://crrev.com/76a02c832b623b811fe508e238fd4e2ab85d1914/sys-devel/llvm/files/cherry/9c5e4bac4a745f6a621dcf2803fa89f6bbe51862.patch
[add] https://crrev.com/fd00fa4043be5bff16ff3c48066f59f4246ec6c2/sys-devel/llvm/files/cherry/46a48e5918ab64e40ed8b929fdb8d2ff4117cfa1.patch
[add] https://crrev.com/fd00fa4043be5bff16ff3c48066f59f4246ec6c2/sys-devel/llvm/files/cherry/385d9f6d5abb6b2d4ea27e59ac1e7b0e20d54f7c.patch
[delete] https://crrev.com/76a02c832b623b811fe508e238fd4e2ab85d1914/sys-devel/llvm/files/cherry/671d92a8e764a3266ecab219d791a27fb257be78.patch
[add] https://crrev.com/fd00fa4043be5bff16ff3c48066f59f4246ec6c2/sys-libs/compiler-rt/files/cherry/46a48e5918ab64e40ed8b929fdb8d2ff4117cfa1.patch
[delete] https://crrev.com/76a02c832b623b811fe508e238fd4e2ab85d1914/sys-devel/llvm/files/cherry/cdc303e5ed4d3110e6f70931775a70bb1de44ed6.patch
[delete] https://crrev.com/76a02c832b623b811fe508e238fd4e2ab85d1914/sys-devel/llvm/files/cherry/bc7dc480be4b503b81d4e63f97fb499b6873a1fa.patch
[rename] https://crrev.com/fd00fa4043be5bff16ff3c48066f59f4246ec6c2/sys-devel/llvm/files/clang-5.0-enable-libunwind-with-compiler-rt.patch
[delete] https://crrev.com/76a02c832b623b811fe508e238fd4e2ab85d1914/sys-devel/llvm/files/cherry/1f177f4a3f2a90b90f5721a4962607d71d551223.patch
[delete] https://crrev.com/76a02c832b623b811fe508e238fd4e2ab85d1914/sys-devel/llvm/files/cherry/cefec9cba5ec1629aac083bad2ad7e10e91dcf05.patch
[add] https://crrev.com/fd00fa4043be5bff16ff3c48066f59f4246ec6c2/sys-libs/compiler-rt/files/llvm-4.0-leak-whitelist.patch
[delete] https://crrev.com/76a02c832b623b811fe508e238fd4e2ab85d1914/sys-devel/llvm/files/cherry/caba5d3de2f61c68651afdff72a223248a660384.patch
[delete] https://crrev.com/76a02c832b623b811fe508e238fd4e2ab85d1914/sys-devel/llvm/files/cherry/5bf7eb503fb9d70121904ea8872f639b9497c1e6.patch
[delete] https://crrev.com/76a02c832b623b811fe508e238fd4e2ab85d1914/sys-devel/llvm/files/cherry/32dc773aa73602b5d5ee6881df5d76decd776018.patch
[delete] https://crrev.com/76a02c832b623b811fe508e238fd4e2ab85d1914/sys-devel/llvm/files/cherry/d7bfb58bc10fa2b57d986b3ca7e6b6d8b9a89974.patch
[delete] https://crrev.com/76a02c832b623b811fe508e238fd4e2ab85d1914/sys-devel/llvm/files/cherry/c31c930cdf7d34987fb1d08e92a4532343241dd3.patch
[rename] https://crrev.com/fd00fa4043be5bff16ff3c48066f59f4246ec6c2/sys-devel/llvm/llvm-5.0_pre300080.ebuild
[delete] https://crrev.com/76a02c832b623b811fe508e238fd4e2ab85d1914/sys-devel/llvm/files/cherry/e209ab4879923a83e9c223aa8318ad9644124189.patch
[delete] https://crrev.com/76a02c832b623b811fe508e238fd4e2ab85d1914/sys-devel/llvm/files/cherry/9eaa3ef462b338fa2426930e2d3072b43291abcf.patch
[delete] https://crrev.com/76a02c832b623b811fe508e238fd4e2ab85d1914/sys-devel/llvm/files/cherry/93418eeb1d886747332ff404f0e2651e8d77879a.patch
[delete] https://crrev.com/76a02c832b623b811fe508e238fd4e2ab85d1914/sys-devel/llvm/files/cherry/3cd5f5be43861486db2205e85416d74403f063d2.patch
[delete] https://crrev.com/76a02c832b623b811fe508e238fd4e2ab85d1914/sys-devel/llvm/files/cherry/objectsize-evalmodes.patch
[add] https://crrev.com/fd00fa4043be5bff16ff3c48066f59f4246ec6c2/sys-libs/compiler-rt/files/llvm-next-leak-whitelist.patch
[rename] https://crrev.com/fd00fa4043be5bff16ff3c48066f59f4246ec6c2/sys-libs/compiler-rt/compiler-rt-5.0_pre300080.ebuild
[delete] https://crrev.com/76a02c832b623b811fe508e238fd4e2ab85d1914/sys-devel/llvm/files/cherry/81323af362fc053dbea0758ca1e02d9af82c0da6.patch
[delete] https://crrev.com/76a02c832b623b811fe508e238fd4e2ab85d1914/sys-devel/llvm/files/cherry/8ac75a18fca87788bd3c69cf0d2b511f438e3262.patch

The following revision refers to this bug:
  https://chromium.googlesource.com/chromiumos/platform2/+/0eeed993adc5f6c4165264caa80328e1a11b5bdd

commit 0eeed993adc5f6c4165264caa80328e1a11b5bdd
Author: Yunlian Jiang <yunlian@google.com>
Date: Fri Apr 28 16:31:34 2017

cryptohome: fix unused lambda capture.

This fixes the error
lambda capture 'this' is not used [-Werror,-Wunused-lambda-capture]

BUG= chromium:714983 
TEST=FEATURES="test" emerge-reef cryptohome

Change-Id: I64dfd2ad3527a4023873928d4bdb0e9e5d0ac234
Reviewed-on: https://chromium-review.googlesource.com/490487
Commit-Queue: Yunlian Jiang <yunlian@chromium.org>
Tested-by: Yunlian Jiang <yunlian@chromium.org>
Trybot-Ready: Yunlian Jiang <yunlian@chromium.org>
Reviewed-by: Manoj Gupta <manojgupta@chromium.org>
Reviewed-by: Andrey Pronin <apronin@chromium.org>

[modify] https://crrev.com/0eeed993adc5f6c4165264caa80328e1a11b5bdd/cryptohome/tpm2_impl.cc

The following revision refers to this bug:
  https://chromium.googlesource.com/aosp/platform/system/tpm/+/0f2599c4b6522d9175e638e8ad88e4f33a3d852e

commit 0f2599c4b6522d9175e638e8ad88e4f33a3d852e
Author: Yunlian Jiang <yunlian@google.com>
Date: Fri Apr 28 16:04:39 2017

trunks: fix unused lambda capture.

This fixes the warning
lambda capture 'this' is not used [-Werror,-Wunused-lambda-capture]

BUG= chromium:714983 
TEST=FEATURES="test" emerge-reef trunks

Change-Id: Ibd8a74df6c73357248ded496201d7162b15eb0d0

[modify] https://crrev.com/0f2599c4b6522d9175e638e8ad88e4f33a3d852e/trunks/power_manager_test.cc

The following revision refers to this bug:
  https://chromium.googlesource.com/aosp/platform/system/tpm/+/ec781e47ec1cf4676dbaa6ded30d4c25ef4409b5

commit ec781e47ec1cf4676dbaa6ded30d4c25ef4409b5
Author: Yunlian Jiang <yunlian@google.com>
Date: Fri Apr 28 16:37:37 2017

attestation: fix unused lambda capture.

This fixes the warning
lambda capture 'this' is not used [-Werror,-Wunused-lambda-capture]

BUG= chromium:714983 
TEST=FEATURES="test" emerge-reef attestation

Change-Id: I6de34b4ef38169ea93fb493fd71f509f1e20121b

[modify] https://crrev.com/ec781e47ec1cf4676dbaa6ded30d4c25ef4409b5/attestation/common/tpm_utility_v2.cc

Will the above CL fixes this issue? https://uberchromegw.corp.google.com/i/chromeos/builders/scarlet-chrome-pfq/builds/37

attestation-0.0.1-r1625: [13/30] CXX aosp/system/tpm/attestation/common/common_library.tpm_utility_v2.o
attestation-0.0.1-r1625: FAILED: aosp/system/tpm/attestation/common/common_library.tpm_utility_v2.o 
attestation-0.0.1-r1625: armv7a-cros-linux-gnueabi-clang++ -MMD -MF aosp/system/tpm/attestation/common/common_library.tpm_utility_v2.o.d -DUSE_TPM2 -D_LARGEFILE_SOURCE -D_LARGEFILE64_SOURCE -D_FILE_OFFSET_BITS=64 -I/build/scarlet/tmp/portage/chromeos-base/attestation-0.0.1-r1625/work/attestation-0.0.1/aosp/system/tpm -Iaosp/system/tpm/attestation/common_library.gen/include -Igen/include -I/build/scarlet/tmp/portage/chromeos-base/attestation-0.0.1-r1625/work/attestation-0.0.1/platform2 -I/build/scarlet/tmp/portage/chromeos-base/attestation-0.0.1-r1625/work/attestation-0.0.1/platform -I/build/scarlet/usr/include -Igen -Wall -Wno-psabi -ggdb3 -fstack-protector-strong -Wformat=2 -fvisibility=internal -Wa,--noexecstack -Werror --sysroot=/build/scarlet -DUSE_RTTI_FOR_TYPE_TAGS -Wno-c++11-extensions -Wno-unused-local-typedefs -DBASE_VER=395517 -pthread -I/build/scarlet/usr/include/chromeos -I/build/scarlet/usr/include/base-395517 -I/build/scarlet/usr/include/glib-2.0 -I/build/scarlet/usr/lib/glib-2.0/include -I/build/scarlet/usr/include/nss -I/build/scarlet/usr/include/nspr -I/build/scarlet/usr/include/dbus-1.0 -I/build/scarlet/usr/lib/dbus-1.0/include -fPIE -std=gnu++11 -D_FILE_OFFSET_BITS=64 -D_LARGEFILE_SOURCE -D_LARGEFILE64_SOURCE -O2 -O2 -O2 -pipe -march=armv8-a+crc -mtune=cortex-a57.cortex-a53 -mfpu=crypto-neon-fp-armv8 -mfloat-abi=hard -g -fno-exceptions -fno-unwind-tables -fno-asynchronous-unwind-tables -clang-syntax -clang-syntax -fno-exceptions -fno-unwind-tables -fno-asynchronous-unwind-tables  -c ../../../../../../../tmp/portage/chromeos-base/attestation-0.0.1-r1625/work/attestation-0.0.1/aosp/system/tpm/attestation/common/tpm_utility_v2.cc -o aosp/system/tpm/attestation/common/common_library.tpm_utility_v2.o
attestation-0.0.1-r1625: ../../../../../../../tmp/portage/chromeos-base/attestation-0.0.1-r1625/work/attestation-0.0.1/aosp/system/tpm/attestation/common/tpm_utility_v2.cc:785:19: error: lambda capture 'this' is not used [-Werror,-Wunused-lambda-capture]
attestation-0.0.1-r1625:       base::Bind([this, &method, &callback]() { method.Run(callback); }));
attestation-0.0.1-r1625:                   ^
attestation-0.0.1-r1625: ../../../../../../../tmp/portage/chromeos-base/attestation-0.0.1-r1625/work/attestation-0.0.1/aosp/system/tpm/attestation/common/tpm_utility_v2.cc:519:3: note: in instantiation of function template specialization 'attestation::TpmUtilityV2::SendTpmManagerRequestAndWait<tpm_manager::ReadSpaceReply, base::Callback<void (const base::Callback<void (const tpm_manager::ReadSpaceReply &), base::internal::CopyMode::Copyable> &), base::internal::CopyMode::Copyable> >' requested here
attestation-0.0.1-r1625:   SendTpmManagerRequestAndWait(
attestation-0.0.1-r1625:   ^
attestation-0.0.1-r1625: ../../../../../../../tmp/portage/chromeos-base/attestation-0.0.1-r1625/work/attestation-0.0.1/aosp/system/tpm/attestation/common/tpm_utility_v2.cc:785:19: error: lambda capture 'this' is not used [-Werror,-Wunused-lambda-capture]
attestation-0.0.1-r1625:       base::Bind([this, &method, &callback]() { method.Run(callback); }));
attestation-0.0.1-r1625:                   ^
attestation-0.0.1-r1625: ../../../../../../../tmp/portage/chromeos-base/attestation-0.0.1-r1625/work/attestation-0.0.1/aosp/system/tpm/attestation/common/tpm_utility_v2.cc:819:3: note: in instantiation of function template specialization 'attestation::TpmUtilityV2::SendTpmManagerRequestAndWait<tpm_manager::GetTpmStatusReply, base::Callback<void (const base::Callback<void (const tpm_manager::GetTpmStatusReply &), base::internal::CopyMode::Copyable> &), base::internal::CopyMode::Copyable> >' requested here
attestation-0.0.1-r1625:   SendTpmManagerRequestAndWait(
attestation-0.0.1-r1625:   ^
attestation-0.0.1-r1625: ../../../../../../../tmp/portage/chromeos-base/attestation-0.0.1-r1625/work/attestation-0.0.1/aosp/system/tpm/attestation/common/tpm_utility_v2.cc:785:19: error: lambda capture 'this' is not used [-Werror,-Wunused-lambda-capture]
attestation-0.0.1-r1625:       base::Bind([this, &method, &callback]() { method.Run(callback); }));
attestation-0.0.1-r1625:                   ^
attestation-0.0.1-r1625: ../../../../../../../tmp/portage/chromeos-base/attestation-0.0.1-r1625/work/attestation-0.0.1/aosp/system/tpm/attestation/common/tpm_utility_v2.cc:884:3: note: in instantiation of function template specialization 'attestation::TpmUtilityV2::SendTpmManagerRequestAndWait<tpm_manager::RemoveOwnerDependencyReply, base::Callback<void (const base::Callback<void (const tpm_manager::RemoveOwnerDependencyReply &), base::internal::CopyMode::Copyable> &), base::internal::CopyMode::Copyable> >' requested here
attestation-0.0.1-r1625:   SendTpmManagerRequestAndWait(
attestation-0.0.1-r1625:   ^
attestation-0.0.1-r1625: 3 errors generated.

If so, we should cherry-pick this CL into today's Chrome pfq to not block pfq, right?

nvm, scarlet-chrome-pfq is experimental build. It is not urgent for today's build.

Roll done. Some packages were broken by new warnings but are fixed now.

The following revision refers to this bug:
  https://chromium.googlesource.com/chromiumos/overlays/chromiumos-overlay/+/71e75736ff31bcb8181426dd32b39e8c6b93a532

commit 71e75736ff31bcb8181426dd32b39e8c6b93a532
Author: Manoj Gupta <manojgupta@google.com>
Date: Sun Apr 30 04:07:51 2017

Update llvm-next to google3 stable r301387.

Does not affect current llvm compiler used.

BUG= chromium:714983 
TEST=no clang crash.

Change-Id: I55c8a16668d2028b6080527158c57cf7db169c0f
Reviewed-on: https://chromium-review.googlesource.com/491067
Commit-Queue: Manoj Gupta <manojgupta@chromium.org>
Tested-by: Manoj Gupta <manojgupta@chromium.org>
Trybot-Ready: Manoj Gupta <manojgupta@chromium.org>
Reviewed-by: Yunlian Jiang <yunlian@chromium.org>

[rename] https://crrev.com/71e75736ff31bcb8181426dd32b39e8c6b93a532/sys-libs/llvm-libunwind/llvm-libunwind-5.0_pre300080-r1.ebuild
[rename] https://crrev.com/71e75736ff31bcb8181426dd32b39e8c6b93a532/sys-libs/compiler-rt/compiler-rt-5.0_pre300080-r1.ebuild
[rename] https://crrev.com/71e75736ff31bcb8181426dd32b39e8c6b93a532/sys-devel/llvm/llvm-5.0_pre300080-r1.ebuild