JIT

GH-145668: Add FOR_ITER specialization for virtual iterators. Specialize GET_ITER. #5802

Job	Run time
Interpreter (Debug)	12m 20s
JIT without optimizations (Debug)	3m 40s
aarch64-unknown-linux-gnu/gcc (Release)	7m 18s
JIT with tail calling interpreter	4m 49s
aarch64-unknown-linux-gnu/gcc (Debug)	9m 9s
x86_64-unknown-linux-gnu/gcc (Debug)	14m 23s
i686-pc-windows-msvc/msvc (Release)	14m 59s
x86_64-pc-windows-msvc/msvc (Release)	15m 22s
x86_64-unknown-linux-gnu/gcc (Release)	8m 54s
x86_64-apple-darwin/clang (Debug)	1h 5m 1s
Free-Threaded (Debug)	3m 52s
aarch64-pc-windows-msvc/msvc (Debug)	25m 39s
aarch64-pc-windows-msvc/msvc (Release)	18m 17s
x86_64-pc-windows-msvc/msvc (Debug)	25m 8s
x86_64-apple-darwin/clang (Release)	32m 28s
aarch64-apple-darwin/clang (Release)	13m 17s
i686-pc-windows-msvc/msvc (Debug)	29m 13s
aarch64-apple-darwin/clang (Debug)	13m 31s
	5h 17m 20s

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