CMake

Add ability to build with Clang on macOS #2235

Job	Run time
run_tests_macos_clang (Release)	22m 23s
run_tests_gcc (Release)	29m 41s
run_tests_clang (Release)	34m 10s
run_tests_macos_clang (Debug)	1h 38m 11s
run_tests_gcc (Debug)	57m 19s
run_tests_clang (Debug)	42m 41s
run_tests_macos_clang (Debug, ADDRESS)	37m 59s
run_tests_gcc (Debug, ADDRESS)	52m 0s
run_tests_clang (Debug, ADDRESS)	41m 28s
run_tests_macos_clang (Debug, UB)	21m 38s
run_tests_gcc (Debug, UB)	42m 34s
run_tests_clang (Debug, UB)	40m 22s
	8h 40m 26s

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