JIT

gh-138451: Support custom LLVM installation path #4409

Job	Run time
Interpreter (Debug)	9m 42s
Free-Threaded (Debug) (21)	15m 45s
JIT with tail calling interpreter (21)	2m 49s
JIT without optimizations (Debug) (21)	11m 41s
i686-pc-windows-msvc/msvc (Release)	12m 34s
i686-pc-windows-msvc/msvc (Debug)	23m 6s
aarch64-pc-windows-msvc/msvc (Release)	18m 24s
x86_64-pc-windows-msvc/msvc (Debug)	21m 35s
x86_64-pc-windows-msvc/msvc (Release)	12m 24s
aarch64-pc-windows-msvc/msvc (Debug)	25m 4s
x86_64-apple-darwin/clang (Release)	20m 53s
x86_64-unknown-linux-gnu/gcc (Debug)	11m 9s
aarch64-apple-darwin/clang (Release)	10m 15s
aarch64-unknown-linux-gnu/gcc (Debug)	7m 43s
aarch64-apple-darwin/clang (Debug)	11m 4s
aarch64-unknown-linux-gnu/gcc (Release)	6m 46s
x86_64-unknown-linux-gnu/gcc (Release)	7m 14s
x86_64-apple-darwin/clang (Debug)	21m 19s
	4h 9m 27s

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