JIT

gh-138451: Support custom LLVM installation path #4224

Job	Run time
Interpreter (Debug)	9m 43s
Free-Threaded (Debug) (19)	16m 52s
JIT without optimizations (Debug) (19)	12m 11s
i686-pc-windows-msvc/msvc (Release)	14m 4s
x86_64-apple-darwin/clang (Debug)	26m 36s
aarch64-pc-windows-msvc/msvc (Debug)	23m 0s
x86_64-pc-windows-msvc/msvc (Release)	15m 32s
aarch64-pc-windows-msvc/msvc (Release)	19m 46s
x86_64-pc-windows-msvc/msvc (Debug)	23m 45s
i686-pc-windows-msvc/msvc (Debug)	23m 27s
x86_64-apple-darwin/clang (Release)	19m 8s
x86_64-unknown-linux-gnu/gcc (Release)	7m 1s
aarch64-apple-darwin/clang (Release)	11m 35s
aarch64-apple-darwin/clang (Debug)	11m 18s
x86_64-unknown-linux-gnu/gcc (Debug)	13m 22s
aarch64-unknown-linux-gnu/gcc (Release)	5m 50s
aarch64-unknown-linux-gnu/gcc (Debug)	7m 15s
	4h 20m 25s

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