Allow translator to use headers from common/spirv Bug: angleproject:4889 Change-Id: Ia297888a97c0ba9cec1283db7f94f2e5b362c27e Reviewed-on: https://chromium-review.googlesource.com/c/angle/angle/+/2815179 Commit-Queue: Shahbaz Youssefi <syoussefi@chromium.org> Reviewed-by: Tim Van Patten <timvp@google.com> Reviewed-by: Jamie Madill <jmadill@chromium.org>