JIT

gh-138497: Support LLVM_VERSION configuration via env #4107

Job	Run time
Interpreter (Debug)	10m 2s
Free-Threaded (Debug) (19)	17m 15s
JIT without optimizations (Debug) (19)	11m 52s
i686-pc-windows-msvc/msvc (Release)	10m 26s
i686-pc-windows-msvc/msvc (Debug)	21m 6s
x86_64-apple-darwin/clang (Debug)	39m 2s
aarch64-pc-windows-msvc/msvc (Release)	16m 20s
x86_64-pc-windows-msvc/msvc (Release)	11m 11s
aarch64-apple-darwin/clang (Debug)	10m 57s
aarch64-pc-windows-msvc/msvc (Debug)	23m 25s
x86_64-apple-darwin/clang (Release)	27m 54s
aarch64-apple-darwin/clang (Release)	9m 28s
x86_64-unknown-linux-gnu/gcc (Debug)	12m 1s
aarch64-unknown-linux-gnu/gcc (Debug)	7m 29s
x86_64-pc-windows-msvc/msvc (Debug)	23m 13s
aarch64-unknown-linux-gnu/gcc (Release)	5m 37s
x86_64-unknown-linux-gnu/gcc (Release)	6m 35s
	4h 23m 53s

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