JIT

GH-136895: Update JIT builds to use LLVM 21 #45

Job	Run time
Interpreter (Debug)	10m 31s
JIT without optimizations (Debug)	2m 10s
aarch64-apple-darwin/clang (Debug)	10m 16s
JIT with tail calling interpreter	2m 58s
aarch64-unknown-linux-gnu/gcc (Release)	6m 6s
aarch64-apple-darwin/clang (Release)	9m 49s
x86_64-unknown-linux-gnu/gcc (Debug)	11m 24s
x86_64-apple-darwin/clang (Debug)	23m 20s
x86_64-unknown-linux-gnu/gcc (Release)	7m 17s
x86_64-apple-darwin/clang (Release)	16m 58s
aarch64-unknown-linux-gnu/gcc (Debug)	7m 42s
aarch64-pc-windows-msvc/msvc (Release)	8m 53s
i686-pc-windows-msvc/msvc (Debug)	2m 26s
i686-pc-windows-msvc/msvc (Release)	2m 31s
x86_64-pc-windows-msvc/msvc (Release)	2m 43s
x86_64-pc-windows-msvc/msvc (Debug)	2m 23s
aarch64-pc-windows-msvc/msvc (Debug)	4m 45s
	2h 12m 12s

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