JIT

Streamline non-specialized FOR_ITER #643

Job	Run time
Interpreter (Debug)	9m 47s
i686-pc-windows-msvc/msvc (Release)	14m 37s
i686-pc-windows-msvc/msvc (Debug)	22m 57s
x86_64-pc-windows-msvc/msvc (Debug)	22m 48s
x86_64-pc-windows-msvc/msvc (Release)	14m 2s
aarch64-unknown-linux-gnu/gcc (Debug)	7m 39s
x86_64-unknown-linux-gnu/gcc (Debug)	10m 37s
x86_64-apple-darwin/clang (Release)	11m 15s
aarch64-pc-windows-msvc/msvc (Release)	21m 14s
aarch64-apple-darwin/clang (Release)	12m 35s
aarch64-unknown-linux-gnu/gcc (Release)	5m 54s
aarch64-apple-darwin/clang (Debug)	12m 2s
x86_64-unknown-linux-gnu/gcc (Release)	6m 48s
aarch64-pc-windows-msvc/msvc (Debug)	24m 30s
x86_64-apple-darwin/clang (Debug)	13m 5s
	3h 29m 50s

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