JIT

GH-134273: Allow setting JIT compiler flags at build time with CFLAGS… #3657

Job	Run time
Interpreter (Debug)	9m 49s
i686-pc-windows-msvc/msvc (Debug)	23m 52s
x86_64-pc-windows-msvc/msvc (Debug)	22m 40s
i686-pc-windows-msvc/msvc (Release)	14m 49s
x86_64-pc-windows-msvc/msvc (Release)	13m 28s
aarch64-pc-windows-msvc/msvc (Debug)	21m 52s
aarch64-apple-darwin/clang (Release)	11m 21s
aarch64-pc-windows-msvc/msvc (Release)	22m 11s
aarch64-apple-darwin/clang (Debug)	12m 13s
x86_64-apple-darwin/clang (Debug)	16m 57s
x86_64-apple-darwin/clang (Release)	11m 37s
x86_64-unknown-linux-gnu/gcc (Debug)	10m 48s
x86_64-unknown-linux-gnu/gcc (Release)	6m 36s
aarch64-unknown-linux-gnu/gcc (Release)	6m 1s
aarch64-unknown-linux-gnu/gcc (Debug)	7m 49s
	3h 32m 3s

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