The following revision refers to this bug:
  https://chromium.googlesource.com/chromiumos/third_party/autotest/+/0595afb7ab7b1fb79ad14208223462b9f7e5c219

commit 0595afb7ab7b1fb79ad14208223462b9f7e5c219
Author: Manoj Gupta <manojgupta@google.com>
Date: Wed Feb 14 05:16:16 2018

platform_ToolchainOptions: Add check for libgcc_s/libstdc++.

As part of migration to llvm based libraries, we want to
prevent new dependencies on libgcc_s/libstdc++. Add a new check
to platform_ToolchainOptions to do so.
Whitelist any current users e.g. binaries delivered from outside,
or built using gcc.

BUG= chromium:811121 
TEST=link/eve/lump/daisy/kevin tryjobs passed with hwtest.

Change-Id: Ic0ced8a33c9d4267a91bebad0754dcac411673c4
Reviewed-on: https://chromium-review.googlesource.com/911995
Commit-Ready: Manoj Gupta <manojgupta@chromium.org>
Tested-by: Manoj Gupta <manojgupta@chromium.org>
Reviewed-by: Manoj Gupta <manojgupta@chromium.org>

[add] https://crrev.com/0595afb7ab7b1fb79ad14208223462b9f7e5c219/client/site_tests/platform_ToolchainOptions/libstdcxx_whitelist
[modify] https://crrev.com/0595afb7ab7b1fb79ad14208223462b9f7e5c219/client/site_tests/platform_ToolchainOptions/platform_ToolchainOptions.py
[add] https://crrev.com/0595afb7ab7b1fb79ad14208223462b9f7e5c219/client/site_tests/platform_ToolchainOptions/libgcc_whitelist

The following revision refers to this bug:
  https://chromium.googlesource.com/chromiumos/third_party/autotest/+/367e5e8568a69fda19eb329b7d125d6cc7ff6904

commit 367e5e8568a69fda19eb329b7d125d6cc7ff6904
Author: Manoj Gupta <manojgupta@google.com>
Date: Thu Feb 22 06:26:46 2018

platform_Toolchainoptions: Whitelist mores files in libgcc/stdlibc++ tests.

Whitelist more files that are delivered as binaries in Chrome OS
from libstdc++/libgcc tests.
Whitelist files installed by crosvm (https://crbug.com/814480).

BUG= chromium:811121 
TEST=No more platform_Toolchain options failures in nyan boards.

Change-Id: I1b031a1f02b5842bf17e90b4d3bbc6ea7ec460ca
Reviewed-on: https://chromium-review.googlesource.com/929358
Commit-Ready: Manoj Gupta <manojgupta@chromium.org>
Tested-by: Manoj Gupta <manojgupta@chromium.org>
Reviewed-by: Yunlian Jiang <yunlian@chromium.org>

[modify] https://crrev.com/367e5e8568a69fda19eb329b7d125d6cc7ff6904/client/site_tests/platform_ToolchainOptions/libstdcxx_whitelist
[modify] https://crrev.com/367e5e8568a69fda19eb329b7d125d6cc7ff6904/client/site_tests/platform_ToolchainOptions/libgcc_whitelist