Vulkan: Roll SPIRV-Tools and SPIRV-Headers. This fixes a bug in SPIRV-Tools validation. vec3s were not being packed properly. Affected some of the more complex dEQP shader tests. Unblocks better Debug error reporting. Bug: angleproject:2552 Change-Id: I83447813a4ae3347157321a30a91b5dee55ff6c1 Reviewed-on: https://chromium-review.googlesource.com/1129824 Commit-Queue: Jamie Madill <jmadill@chromium.org> Reviewed-by: Luc Ferron <lucferron@chromium.org> Reviewed-by: Tobin Ehlis <tobine@google.com>