gh-118306: Update JIT compilation to use LLVM 18 #774

Job	Run time
i686-pc-windows-msvc/msvc (Debug)	17m 54s
i686-pc-windows-msvc/msvc (Release)	23m 27s
x86_64-pc-windows-msvc/msvc (Debug)	17m 17s
x86_64-pc-windows-msvc/msvc (Release)	20m 50s
aarch64-pc-windows-msvc/msvc (Debug)	6m 17s
aarch64-pc-windows-msvc/msvc (Release)	5m 45s
x86_64-apple-darwin/clang (Debug)	11m 35s
x86_64-apple-darwin/clang (Release)	14m 40s
aarch64-apple-darwin/clang (Debug)	9m 7s
aarch64-apple-darwin/clang (Release)	13m 13s
x86_64-unknown-linux-gnu/gcc (Debug)	7m 53s
x86_64-unknown-linux-gnu/gcc (Release)	9m 1s
x86_64-unknown-linux-gnu/clang (Debug)	7m 58s
x86_64-unknown-linux-gnu/clang (Release)	8m 2s
aarch64-unknown-linux-gnu/gcc (Debug)	1h 9m 24s
aarch64-unknown-linux-gnu/gcc (Release)	51m 34s
aarch64-unknown-linux-gnu/clang (Debug)	1h 4m 4s
aarch64-unknown-linux-gnu/clang (Release)	34m 6s
	6h 32m 7s

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