JIT

gh-138451: Support custom LLVM installation path #4220

Job	Run time
Interpreter (Debug)	9m 51s
Free-Threaded (Debug) (19)	17m 0s
JIT without optimizations (Debug) (19)	15m 29s
i686-pc-windows-msvc/msvc (Release)	13m 40s
i686-pc-windows-msvc/msvc (Debug)	23m 51s
x86_64-apple-darwin/clang (Debug)	23m 44s
aarch64-pc-windows-msvc/msvc (Debug)	23m 39s
x86_64-pc-windows-msvc/msvc (Release)	13m 53s
x86_64-apple-darwin/clang (Release)	21m 24s
x86_64-pc-windows-msvc/msvc (Debug)	22m 51s
x86_64-unknown-linux-gnu/gcc (Release)	7m 16s
aarch64-apple-darwin/clang (Release)	9m 33s
aarch64-unknown-linux-gnu/gcc (Release)	6m 43s
aarch64-apple-darwin/clang (Debug)	11m 49s
x86_64-unknown-linux-gnu/gcc (Debug)	11m 5s
aarch64-pc-windows-msvc/msvc (Release)	17m 14s
aarch64-unknown-linux-gnu/gcc (Debug)	7m 11s
	4h 16m 13s

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