JIT

gh-115999: Add free-threaded specialization for FOR_ITER #2908

Job	Run time
Interpreter (Debug)	8m 31s
Free-Threaded (Debug) (19)	20m 15s
i686-pc-windows-msvc/msvc (Debug)	18m 41s
i686-pc-windows-msvc/msvc (Release)	11m 31s
x86_64-pc-windows-msvc/msvc (Debug)	18m 16s
x86_64-pc-windows-msvc/msvc (Release)	12m 3s
aarch64-pc-windows-msvc/msvc (Debug)	4m 18s
aarch64-pc-windows-msvc/msvc (Release)	6m 46s
x86_64-apple-darwin/clang (Debug)	11m 40s
x86_64-apple-darwin/clang (Release)	8m 11s
aarch64-apple-darwin/clang (Debug)	10m 47s
aarch64-apple-darwin/clang (Release)	11m 35s
x86_64-unknown-linux-gnu/gcc (Debug)	15m 30s
x86_64-unknown-linux-gnu/gcc (Release)	11m 50s
aarch64-unknown-linux-gnu/gcc (Debug)	10m 13s
aarch64-unknown-linux-gnu/gcc (Release)	6m 58s
	3h 7m 5s

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