Merge pull request #18 from ThomasRaoux/update_llvm #72

Job	Run time
build (ubuntu-latest, centos-7, release)	3h 47m 5s
build (ubuntu-latest, centos-7, assert)	4h 25m 53s
build (ubuntu-latest, ubuntu-18.04, release)	4h 14m 18s
build (ubuntu-latest, ubuntu-18.04, assert)	3h 45m 59s
build (macos-13, local, release)	1h 54m 6s
build (macos-13, local, assert)	1h 42m 40s
build (macos-13-arm64, local, release)	37m 46s
build (macos-13-arm64, local, assert)	39m 50s
upload-tarballs	11m 10s
	21h 18m 47s

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