JIT

GH-145668: Add FOR_ITER specialization for virtual iterators. Specialize GET_ITER. #5804

Job	Run time
Interpreter (Debug)	12m 7s
Free-Threaded (Debug)	3m 49s
JIT without optimizations (Debug)	3m 12s
x86_64-unknown-linux-gnu/gcc (Release)	8m 54s
aarch64-unknown-linux-gnu/gcc (Release)	7m 6s
JIT with tail calling interpreter	4m 53s
aarch64-apple-darwin/clang (Debug)	12m 49s
x86_64-apple-darwin/clang (Release)	18m 59s
x86_64-apple-darwin/clang (Debug)	18m 58s
aarch64-unknown-linux-gnu/gcc (Debug)	8m 53s
x86_64-unknown-linux-gnu/gcc (Debug)	14m 33s
aarch64-apple-darwin/clang (Release)	11m 45s
i686-pc-windows-msvc/msvc (Release)	17m 4s
i686-pc-windows-msvc/msvc (Debug)	18m 43s
x86_64-pc-windows-msvc/msvc (Debug)	18m 46s
aarch64-pc-windows-msvc/msvc (Release)	18m 46s
x86_64-pc-windows-msvc/msvc (Release)	16m 8s
aarch64-pc-windows-msvc/msvc (Debug)	18m 45s
	3h 54m 10s

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