separate codegen and compiler #65

Job	Run time
Interpreter (Debug)	6m 36s
Free-Threaded (Debug)	10m 14s
i686-pc-windows-msvc/msvc (Debug)	17m 28s
i686-pc-windows-msvc/msvc (Release)	20m 10s
x86_64-pc-windows-msvc/msvc (Debug)	16m 55s
x86_64-pc-windows-msvc/msvc (Release)	20m 38s
aarch64-pc-windows-msvc/msvc (Debug)	3m 30s
aarch64-pc-windows-msvc/msvc (Release)	5m 50s
x86_64-apple-darwin/clang (Debug)	11m 12s
x86_64-apple-darwin/clang (Release)	15m 25s
aarch64-apple-darwin/clang (Debug)	9m 24s
aarch64-apple-darwin/clang (Release)	12m 56s
x86_64-unknown-linux-gnu/gcc (Debug)	7m 59s
x86_64-unknown-linux-gnu/gcc (Release)	17m 24s
x86_64-unknown-linux-gnu/clang (Debug)	7m 41s
x86_64-unknown-linux-gnu/clang (Release)	13m 33s
aarch64-unknown-linux-gnu/gcc (Debug)	1h 10m 52s
aarch64-unknown-linux-gnu/gcc (Release)	51m 48s
aarch64-unknown-linux-gnu/clang (Debug)	1h 4m 50s
aarch64-unknown-linux-gnu/clang (Release)	35m 23s
	6h 59m 48s

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