JIT

GH-145668: Add FOR_ITER specialization for virtual iterators. Specialize GET_ITER. #5966

Job	Run time
aarch64-unknown-linux-gnu/gcc (Release)	7m 17s
x86_64-unknown-linux-gnu/gcc (Debug)	14m 34s
Free-Threaded (Debug)	3m 52s
JIT without optimizations (Debug)	3m 48s
JIT with tail calling interpreter	4m 44s
Interpreter (Debug)	12m 25s
x86_64-apple-darwin/clang (Debug)	41m 38s
x86_64-unknown-linux-gnu/gcc (Release)	8m 58s
aarch64-unknown-linux-gnu/gcc (Debug)	8m 52s
x86_64-pc-windows-msvc/msvc (Release)	15m 1s
aarch64-pc-windows-msvc/msvc (Debug)	26m 4s
x86_64-apple-darwin/clang (Release)	29m 25s
x86_64-pc-windows-msvc/msvc (Debug)	29m 12s
aarch64-pc-windows-msvc/msvc (Release)	19m 38s
aarch64-apple-darwin/clang (Debug)	17m 49s
i686-pc-windows-msvc/msvc (Release)	16m 9s
aarch64-apple-darwin/clang (Release)	14m 54s
i686-pc-windows-msvc/msvc (Debug)	30m 19s
	5h 4m 39s

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