JIT

gh-138451: Support custom LLVM installation path #3967

Job	Run time
Interpreter (Debug)	10m 3s
i686-pc-windows-msvc/msvc (Release)	5m 17s
x86_64-pc-windows-msvc/msvc (Debug)	4m 37s
x86_64-pc-windows-msvc/msvc (Release)	5m 4s
i686-pc-windows-msvc/msvc (Debug)	4m 50s
aarch64-pc-windows-msvc/msvc (Debug)	5m 37s
x86_64-unknown-linux-gnu/gcc (Release)	2m 46s
aarch64-pc-windows-msvc/msvc (Release)	6m 24s
x86_64-apple-darwin/clang (Debug)	4m 36s
aarch64-apple-darwin/clang (Debug)	2m 35s
x86_64-apple-darwin/clang (Release)	4m 20s
aarch64-apple-darwin/clang (Release)	2m 11s
aarch64-unknown-linux-gnu/gcc (Release)	1m 50s
aarch64-unknown-linux-gnu/gcc (Debug)	1m 30s
x86_64-unknown-linux-gnu/gcc (Debug)	2m 9s
	1h 3m 49s

Provide feedback