JIT

Merge main; improvements to test_opt.py #11

Job	Run time
i686-pc-windows-msvc/msvc (Debug)	15m 54s
i686-pc-windows-msvc/msvc (Release)	19m 36s
x86_64-pc-windows-msvc/msvc (Debug)	16m 23s
x86_64-pc-windows-msvc/msvc (Release)	20m 55s
x86_64-apple-darwin/clang (Debug)	1h 0m 16s
x86_64-apple-darwin/clang (Release)	12m 17s
aarch64-apple-darwin/clang (Debug)	8m 42s
aarch64-apple-darwin/clang (Release)	12m 5s
x86_64-unknown-linux-gnu/gcc (Debug)	6m 37s
x86_64-unknown-linux-gnu/gcc (Release)	16m 18s
x86_64-unknown-linux-gnu/clang (Debug)	7m 9s
x86_64-unknown-linux-gnu/clang (Release)	13m 27s
aarch64-unknown-linux-gnu/gcc (Debug)	54m 41s
aarch64-unknown-linux-gnu/gcc (Release)	44m 19s
aarch64-unknown-linux-gnu/clang (Debug)	51m 12s
aarch64-unknown-linux-gnu/clang (Release)	30m 6s
	6h 29m 57s

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