JIT

gh-138497: Support LLVM_VERSION configuration via env #4000

Job	Run time
Interpreter (Debug)	9m 53s
x86_64-pc-windows-msvc/msvc (Release)	14m 27s
i686-pc-windows-msvc/msvc (Release)	15m 5s
x86_64-apple-darwin/clang (Debug)	20m 15s
aarch64-unknown-linux-gnu/gcc (Debug)	7m 27s
x86_64-pc-windows-msvc/msvc (Debug)	22m 55s
aarch64-pc-windows-msvc/msvc (Debug)	22m 54s
aarch64-pc-windows-msvc/msvc (Release)	19m 37s
x86_64-unknown-linux-gnu/gcc (Release)	7m 8s
x86_64-apple-darwin/clang (Release)	10m 42s
i686-pc-windows-msvc/msvc (Debug)	23m 8s
x86_64-unknown-linux-gnu/gcc (Debug)	11m 57s
aarch64-unknown-linux-gnu/gcc (Release)	5m 50s
aarch64-apple-darwin/clang (Debug)	10m 27s
aarch64-apple-darwin/clang (Release)	10m 25s
	3h 32m 10s

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