[llvm] r354051 - Recommit Optional specialization for trivially copyable types

[Serge Guelton via llvm-commits]

On Fri, Feb 15, 2019 at 01:59:54PM +0100, Hans Wennborg wrote:
> This fixed the Chromium build, and it also seems to have helped the
> clang-cmake-x86_64-avx2-linux bot ("ninja check 1" is green on
> http://lab.llvm.org:8011/builders/clang-cmake-x86_64-avx2-linux/builds/8318)
> so I'll let the revert stay in.

Thanks Hans. Meanwhile I've been working on a fix, which is currently under test with gcc 4.8.5.
If it validates locally I'll push it, and I'll revert if needs be.