G4 senddesc refactor #3678

Job	Run time
download-OpenCL-Clang	8s
build-SPIRV-LLVM-Translator (20.04, 14)	11s
build-SPIRV-LLVM-Translator (22.04, 14)	10s
build-SPIRV-LLVM-Translator (20.04, 10, true)	14s
build-SPIRV-LLVM-Translator (20.04, 11, true)	10s
build-SPIRV-LLVM-Translator (22.04, 12, true)	10s
build-SPIRV-LLVM-Translator (22.04, 13, true)	11s
build-SPIRV-LLVM-Translator (22.04, 15, true)	15s
build-IGC (20.04, 14, gcc)	48m 37s
build-IGC (20.04, 14, clang)	29m 29s
build-IGC (22.04, 14, gcc)	41m 36s
build-IGC (22.04, 14, clang)	30m 20s
build-IGC (20.04, 10, gcc, true)	31m 9s
build-IGC (20.04, 11, gcc, true)	49m 34s
build-IGC (22.04, 12, gcc, true)	55m 53s
build-IGC (22.04, 13, gcc, true)	42m 27s
build-IGC (22.04, 15, gcc, true)	54m 57s
	6h 25m 31s

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