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This CL does a combined roll of spirv-tools and headers to deal with
new enum additions.

Change-Id: I6a97855ff72f67e906ba22ad5a080c9c2b57ebe3
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2490241
Commit-Queue: dsinclair <dsinclair@chromium.org>
Commit-Queue: Corentin Wallez <cwallez@chromium.org>
Auto-Submit: dsinclair <dsinclair@chromium.org>
Reviewed-by: Corentin Wallez <cwallez@chromium.org>
Cr-Commit-Position: refs/heads/master@{#819447}