JIT

GH-140479: Update JIT builds to use LLVM 21 (#140973) #4335

Job	Run time
Interpreter (Debug)	10m 11s
JIT without optimizations (Debug) (21)	10m 54s
Free-Threaded (Debug) (21)	15m 11s
JIT with tail calling interpreter (21)	3m 17s
x86_64-pc-windows-msvc/msvc (Release)	11m 42s
x86_64-pc-windows-msvc/msvc (Debug)	20m 44s
aarch64-pc-windows-msvc/msvc (Debug)	24m 35s
i686-pc-windows-msvc/msvc (Release)	11m 40s
x86_64-unknown-linux-gnu/gcc (Debug)	10m 57s
i686-pc-windows-msvc/msvc (Debug)	21m 9s
aarch64-unknown-linux-gnu/gcc (Release)	5m 33s
aarch64-pc-windows-msvc/msvc (Release)	17m 50s
aarch64-apple-darwin/clang (Release)	10m 33s
x86_64-apple-darwin/clang (Release)	22m 4s
x86_64-unknown-linux-gnu/gcc (Release)	6m 36s
x86_64-apple-darwin/clang (Debug)	28m 19s
aarch64-unknown-linux-gnu/gcc (Debug)	8m 52s
aarch64-apple-darwin/clang (Debug)	15m 29s
	4h 15m 36s

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