The following revision refers to this bug:
  https://chromium.googlesource.com/chromiumos/overlays/chromiumos-overlay/+/917ac115c1dc8336893e539e9807fb989e50a5c2

commit 917ac115c1dc8336893e539e9807fb989e50a5c2
Author: Manoj Gupta <manojgupta@google.com>
Date: Fri Jul 13 15:14:28 2018

llvm-libunwind: Update to current llvm versions.

Update the llvm-libunwind to match current llvm versions.
NFC since llvm-libunwind is not installed currently.
Make few fixes to ensure that llvm-libunwind can be built for
multilib 32/64 bits on host.

BUG= chromium:863286 
TEST=sudo emerge llvm-libunwind works & installs both 32-bit/64-bit
libraries..

Change-Id: Id967cc8cb44c10ab8e6131fe60222cb4f29628cb
Reviewed-on: https://chromium-review.googlesource.com/1136214
Commit-Ready: Manoj Gupta <manojgupta@chromium.org>
Tested-by: Manoj Gupta <manojgupta@chromium.org>
Reviewed-by: Manoj Gupta <manojgupta@chromium.org>

[rename] https://crrev.com/917ac115c1dc8336893e539e9807fb989e50a5c2/sys-libs/llvm-libunwind/llvm-libunwind-7.0_pre331547.ebuild
[modify] https://crrev.com/917ac115c1dc8336893e539e9807fb989e50a5c2/profiles/targets/sdk/package.use