JIT

GH-145668: Add FOR_ITER specialization for virtual iterators. Specialize GET_ITER. #6206

Job	Run time
JIT with tail calling interpreter	4m 56s
aarch64-apple-darwin/clang (Debug)	16m 20s
x86_64-apple-darwin/clang (Debug)	30m 6s
Free-Threaded (Debug)	3m 55s
aarch64-unknown-linux-gnu/gcc (Debug)	8m 53s
x86_64-apple-darwin/clang (Release)	23m 49s
aarch64-pc-windows-msvc/msvc (Release)	17m 48s
x86_64-pc-windows-msvc/msvc (Release)	15m 17s
Interpreter (Debug)	9m 36s
i686-pc-windows-msvc/msvc (Release)	16m 17s
x86_64-unknown-linux-gnu/gcc (Debug)	13m 26s
aarch64-pc-windows-msvc/msvc (Debug)	26m 18s
aarch64-unknown-linux-gnu/gcc (Release)	7m 15s
JIT without optimizations (Debug)	3m 32s
aarch64-apple-darwin/clang (Release)	15m 13s
x86_64-pc-windows-msvc/msvc (Debug)	31m 12s
x86_64-unknown-linux-gnu/gcc (Release)	8m 52s
i686-pc-windows-msvc/msvc (Debug)	30m 38s
	4h 43m 23s

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