Second re-land fixes git.bat access on developer machines.

Re-landing with upstream fixes to the layers so they no longer
need to copy the parameter validation errors to the current
working directory of the layer generation. Also includes fixes
for the GCC build.

This hasn't been updated in a while, so there are many changes.
It should also include better validation for memory barriers.

Also includes updated builds for SPIRV Tools and glslang.
A few pull requests need to land before landing this in ANGLE.

This second step re-enables Vulkan and includes the updated build.

Includes a workaround for parameter_validation.h no longer being
auto-generated, and the stale file clobbering the build.

Also includes a fix for an incorrect memory barrier.

Bug: angleproject:2237
Change-Id: Ic1a3ad7458bb743d7279a1af9334693ab6cb59d6
Reviewed-on: https://chromium-review.googlesource.com/845859Reviewed-by: Jamie Madill <jmadill@chromium.org>
Commit-Queue: Jamie Madill <jmadill@chromium.org>