Required to roll both SPIRV-tools and SPIRV-headers at once due to a
conflicting change.

Bug: angleproject:3422
Change-Id: I8160046899acce01a38e1ddcf43370f278349bac
Reviewed-on: https://chromium-review.googlesource.com/c/angle/angle/+/1599250Reviewed-by: Shahbaz Youssefi <syoussefi@chromium.org>
Commit-Queue: Jonah Ryan-Davis <jonahr@google.com>