JIT

gh-138497: Support LLVM_VERSION configuration via env #4020

Job	Run time
Interpreter (Debug)	9m 53s
i686-pc-windows-msvc/msvc (Debug)	23m 9s
x86_64-pc-windows-msvc/msvc (Release)	14m 9s
x86_64-pc-windows-msvc/msvc (Debug)	22m 24s
x86_64-apple-darwin/clang (Release)	11m 33s
aarch64-pc-windows-msvc/msvc (Release)	17m 34s
x86_64-apple-darwin/clang (Debug)	17m 23s
i686-pc-windows-msvc/msvc (Release)	13m 39s
x86_64-unknown-linux-gnu/gcc (Debug)	12m 54s
aarch64-unknown-linux-gnu/gcc (Release)	5m 29s
aarch64-unknown-linux-gnu/gcc (Debug)	7m 3s
aarch64-apple-darwin/clang (Release)	11m 15s
aarch64-pc-windows-msvc/msvc (Debug)	24m 42s
x86_64-unknown-linux-gnu/gcc (Release)	6m 45s
aarch64-apple-darwin/clang (Debug)	10m 43s
	3h 28m 35s

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