JIT

GH-136895: Update JIT builds to use LLVM 20 #4197

Job	Run time
Interpreter (Debug)	9m 59s
Free-Threaded (Debug)	15m 28s
JIT without optimizations (Debug)	10m 40s
i686-pc-windows-msvc/msvc (Debug)	21m 59s
aarch64-pc-windows-msvc/msvc (Debug)	22m 4s
aarch64-apple-darwin/clang (Release)	11m 59s
x86_64-pc-windows-msvc/msvc (Release)	12m 23s
x86_64-unknown-linux-gnu/gcc (Debug)	11m 56s
aarch64-pc-windows-msvc/msvc (Release)	15m 59s
x86_64-pc-windows-msvc/msvc (Debug)	20m 48s
x86_64-apple-darwin/clang (Debug)	27m 8s
aarch64-unknown-linux-gnu/gcc (Debug)	8m 1s
aarch64-apple-darwin/clang (Debug)	10m 45s
aarch64-unknown-linux-gnu/gcc (Release)	5m 42s
x86_64-apple-darwin/clang (Release)	22m 28s
x86_64-unknown-linux-gnu/gcc (Release)	7m 28s
i686-pc-windows-msvc/msvc (Release)	11m 38s
	4h 6m 25s

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