JIT

gh-138497: Support LLVM_VERSION configuration via env #4091

Job	Run time
Interpreter (Debug)	9m 46s
Free-Threaded (Debug) (19)	15m 54s
JIT without optimizations (Debug) (19)	13m 12s
aarch64-pc-windows-msvc/msvc (Release)	17m 10s
aarch64-apple-darwin/clang (Release)	10m 35s
x86_64-unknown-linux-gnu/gcc (Release)	8m 26s
x86_64-apple-darwin/clang (Debug)	20m 29s
i686-pc-windows-msvc/msvc (Debug)	38m 50s
x86_64-unknown-linux-gnu/gcc (Debug)	11m 41s
x86_64-pc-windows-msvc/msvc (Release)	13m 48s
x86_64-pc-windows-msvc/msvc (Debug)	23m 25s
aarch64-unknown-linux-gnu/gcc (Debug)	7m 15s
aarch64-apple-darwin/clang (Debug)	11m 35s
aarch64-pc-windows-msvc/msvc (Debug)	22m 52s
i686-pc-windows-msvc/msvc (Release)	14m 6s
aarch64-unknown-linux-gnu/gcc (Release)	5m 45s
x86_64-apple-darwin/clang (Release)	18m 10s
	4h 22m 59s

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