Roll Vulkan-ValidationLayers from 78d6199679ef to e1f91ba6c4bb (3 revisions)

https://chromium.googlesource.com/external/github.com/KhronosGroup/Vulkan-ValidationLayers/+log/78d6199679ef..e1f91ba6c4bb

2021-08-20 nathaniel@lunarg.com tests: Refactor SPV compilation
2021-08-20 nathaniel@lunarg.com tests: Add tests for invalid spec. constants
2021-08-20 nathaniel@lunarg.com layers: Address issue 2955

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Change-Id: I526245475dfe70564e81f43b0824fb1d986ac4d4
Reviewed-on: https://chromium-review.googlesource.com/c/vulkan-deps/+/3111188
Bot-Commit: chromium-autoroll <chromium-autoroll@skia-public.iam.gserviceaccount.com>

• DEPS[diff]