LLVM CI

Make `Process#wait` asynchronous on Windows #515

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Run time

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Job	Run time
LLVM 13.0.0	11m 32s
LLVM 14.0.0	11m 31s
LLVM 15.0.6	9m 2s
LLVM 16.0.3	2m 18s
LLVM 17.0.2	8m 5s
	42m 28s