This was fixed upstream in glslang.

Bug: None
Change-Id: I21751dba101fe39f94c91de6e73853ee9ad8c8f2
Reviewed-on: https://chromium-review.googlesource.com/1200366Reviewed-by: Jamie Madill <jmadill@chromium.org>
Commit-Queue: Jamie Madill <jmadill@chromium.org>