Roll SPIRV-Tools from 4dbc66380dd6 to a6e6454ef27f (1 revision)

https://chromium.googlesource.com/external/github.com/KhronosGroup/SPIRV-Tools.git/+log/4dbc66380dd6..a6e6454ef27f

2022-10-06 kevin.petit@arm.com spirv-val: Add SPV_ARM_core_builtins validation (#4958)

If this roll has caused a breakage, revert this CL and stop the roller
using the controls here:
https://autoroll.skia.org/r/spirv-tools-vulkan-deps-autoroll
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is aware of the problem.

To report a problem with the AutoRoller itself, please file a bug:
https://bugs.chromium.org/p/skia/issues/entry?template=Autoroller+Bug

Documentation for the AutoRoller is here:
https://skia.googlesource.com/buildbot/+doc/main/autoroll/README.md

Tbr: radial-bots+chrome-roll@google.com
Change-Id: I082315a8149e915243b8dc9d24284c75287697e8
Reviewed-on: https://chromium-review.googlesource.com/c/vulkan-deps/+/3937422
Bot-Commit: chromium-autoroll <chromium-autoroll@skia-public.iam.gserviceaccount.com>