Add CrossSignatureSRB test, and corresponding fix for it. #4003

Job	Run time
Linux -> Pre-checks	17s
Linux -> Clang-NO_GLSLANG-NO_HLSL-x64, Release	6m 32s
Linux -> Clang-x64, Release	13m 19s
Linux -> GCC-x64, Debug	13m 0s
Linux -> Clang-NO_GLSLANG-x64, Debug	8m 3s
Linux -> GCC-x64, Release	11m 12s
Linux -> Clang-x64, Debug	13m 40s
	1h 6m 3s

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