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The LLVM code keeps running into issues with the GCC version we've
been using so far (5.3.0). Try a more recent version to hopefully
get fewer problems.

This was built on a Trusty machine, according to the recipe at
https://bugs.chromium.org/p/chromium/issues/detail?id=929645#c9

Bug: 1164952
Change-Id: If5e015d011417bc5b9669829ceefae3266808e20
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2622968
Auto-Submit: Hans Wennborg <hans@chromium.org>
Commit-Queue: Nico Weber <thakis@chromium.org>
Reviewed-by: Nico Weber <thakis@chromium.org>
Cr-Commit-Position: refs/heads/master@{#842492}