Turn on LdStCombine #3720

Job	Run time
download-OpenCL-Clang	7s
build-SPIRV-LLVM-Translator (20.04, 14)	12s
build-SPIRV-LLVM-Translator (22.04, 14)	15s
build-SPIRV-LLVM-Translator (20.04, 10, true)	14s
build-SPIRV-LLVM-Translator (20.04, 11, true)	14s
build-SPIRV-LLVM-Translator (22.04, 12, true)	13s
build-SPIRV-LLVM-Translator (22.04, 13, true)	13s
build-SPIRV-LLVM-Translator (22.04, 15, true)	10s
build-IGC (20.04, 14, gcc)	1h 2m 37s
build-IGC (20.04, 14, clang)	30m 51s
build-IGC (22.04, 14, gcc)	53m 27s
build-IGC (22.04, 14, clang)	32m 1s
build-IGC (20.04, 10, gcc, true)	38m 56s
build-IGC (20.04, 11, gcc, true)	49m 21s
build-IGC (22.04, 12, gcc, true)	38m 9s
build-IGC (22.04, 13, gcc, true)	56m 18s
build-IGC (22.04, 15, gcc, true)	42m 5s
	6h 45m 23s

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