JIT

gh-138497: Support LLVM_VERSION configuration via env #4093

Job	Run time
Interpreter (Debug)	9m 51s
Free-Threaded (Debug) (19)	17m 3s
JIT without optimizations (Debug) (19)	13m 17s
x86_64-pc-windows-msvc/msvc (Debug)	22m 2s
x86_64-pc-windows-msvc/msvc (Release)	14m 2s
aarch64-apple-darwin/clang (Debug)	13m 47s
x86_64-apple-darwin/clang (Release)	14m 38s
aarch64-pc-windows-msvc/msvc (Debug)	21m 46s
x86_64-apple-darwin/clang (Debug)	24m 24s
i686-pc-windows-msvc/msvc (Release)	14m 7s
i686-pc-windows-msvc/msvc (Debug)	23m 55s
aarch64-pc-windows-msvc/msvc (Release)	18m 58s
aarch64-unknown-linux-gnu/gcc (Release)	5m 42s
x86_64-unknown-linux-gnu/gcc (Debug)	12m 10s
x86_64-unknown-linux-gnu/gcc (Release)	7m 37s
aarch64-apple-darwin/clang (Release)	11m 23s
aarch64-unknown-linux-gnu/gcc (Debug)	7m 10s
	4h 11m 52s

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