JIT

GH-136895: Update JIT builds to use LLVM 21 #42

Job	Run time
JIT without optimizations (Debug)	2m 19s
aarch64-pc-windows-msvc/msvc (Release)	6m 51s
x86_64-unknown-linux-gnu/gcc (Release)	7m 28s
i686-pc-windows-msvc/msvc (Release)	5m 3s
aarch64-apple-darwin/clang (Release)	9m 10s
JIT with tail calling interpreter	2m 52s
x86_64-pc-windows-msvc/msvc (Debug)	5m 5s
aarch64-unknown-linux-gnu/gcc (Debug)	7m 25s
aarch64-apple-darwin/clang (Debug)	13m 6s
aarch64-unknown-linux-gnu/gcc (Release)	7m 36s
x86_64-apple-darwin/clang (Debug)	20m 39s
Interpreter (Debug)	10m 20s
i686-pc-windows-msvc/msvc (Debug)	5m 5s
x86_64-apple-darwin/clang (Release)	14m 1s
x86_64-unknown-linux-gnu/gcc (Debug)	10m 33s
aarch64-pc-windows-msvc/msvc (Debug)	7m 44s
x86_64-pc-windows-msvc/msvc (Release)	5m 4s
	2h 20m 21s

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