Add CrossSignatureSRB test, and corresponding fix for it. #4000

Job	Run time
Linux -> Pre-checks	17s
Linux -> Clang-x64, Debug	13m 36s
Linux -> Clang-NO_GLSLANG-NO_HLSL-x64, Release	6m 25s
Linux -> Clang-x64, Release	13m 17s
Linux -> GCC-x64, Debug	12m 32s
Linux -> GCC-x64, Release	11m 19s
Linux -> Clang-NO_GLSLANG-x64, Debug	8m 11s
	1h 5m 37s

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