JIT

gh-138451: Support custom LLVM installation path #6265

Job	Run time
Interpreter (Debug)	12m 49s
x86_64-apple-darwin/clang (Release)	24m 50s
Free-Threaded (Debug)	4m 8s
JIT without optimizations (Debug)	3m 58s
aarch64-unknown-linux-gnu/gcc (Debug)	9m 40s
x86_64-unknown-linux-gnu/gcc (Debug)	13m 28s
i686-pc-windows-msvc/msvc (Release)	15m 16s
x86_64-apple-darwin/clang (Debug)	37m 2s
i686-pc-windows-msvc/msvc (Debug)	21m 59s
x86_64-unknown-linux-gnu/gcc (Release)	9m 11s
x86_64-pc-windows-msvc/msvc (Debug)	30m 38s
aarch64-apple-darwin/clang (Debug)	14m 47s
x86_64-pc-windows-msvc/msvc (Release)	19m 37s
JIT with tail calling interpreter	4m 41s
aarch64-pc-windows-msvc/msvc (Debug)	26m 18s
aarch64-unknown-linux-gnu/gcc (Release)	7m 6s
aarch64-pc-windows-msvc/msvc (Release)	18m 12s
aarch64-apple-darwin/clang (Release)	13m 46s
	4h 47m 26s

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