JIT

gh-138497: Support LLVM_VERSION configuration via env #4067

Job	Run time
Interpreter (Debug)	9m 53s
JIT without optimizations (Debug) (19)	12m 28s
i686-pc-windows-msvc/msvc (Debug)	23m 38s
x86_64-pc-windows-msvc/msvc (Release)	14m 30s
x86_64-pc-windows-msvc/msvc (Debug)	24m 25s
i686-pc-windows-msvc/msvc (Release)	14m 34s
aarch64-pc-windows-msvc/msvc (Release)	18m 47s
aarch64-apple-darwin/clang (Debug)	11m 14s
aarch64-pc-windows-msvc/msvc (Debug)	24m 28s
aarch64-unknown-linux-gnu/gcc (Release)	5m 57s
x86_64-apple-darwin/clang (Release)	15m 15s
aarch64-apple-darwin/clang (Release)	11m 15s
x86_64-apple-darwin/clang (Debug)	21m 7s
x86_64-unknown-linux-gnu/gcc (Release)	9m 11s
x86_64-unknown-linux-gnu/gcc (Debug)	13m 2s
aarch64-unknown-linux-gnu/gcc (Debug)	7m 39s
	3h 57m 23s

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