LLVM CI

Improve `__crystal_once` performance #4520

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Job	Run time
LLVM 13	29m 10s
LLVM 14	28m 15s
LLVM 15	26m 41s
LLVM 16	26m 54s
LLVM 17	27m 13s
LLVM 18	27m 42s
LLVM 19	28m 45s
	3h 14m 40s