gh-125038: CHECK_ITER instruction removed, use GET_ITER instead #6

Job	Run time
Interpreter (Debug)	6m 56s
Free-Threaded (Debug)	10m 31s
i686-pc-windows-msvc/msvc (Debug)	17m 38s
i686-pc-windows-msvc/msvc (Release)	20m 53s
x86_64-pc-windows-msvc/msvc (Debug)	18m 7s
x86_64-pc-windows-msvc/msvc (Release)	16m 46s
aarch64-pc-windows-msvc/msvc (Debug)	4m 9s
aarch64-pc-windows-msvc/msvc (Release)	6m 0s
x86_64-apple-darwin/clang (Debug)	1h 20m 18s
x86_64-apple-darwin/clang (Release)	13m 33s
aarch64-apple-darwin/clang (Debug)	8m 44s
aarch64-apple-darwin/clang (Release)	13m 23s
x86_64-unknown-linux-gnu/gcc (Debug)	7m 49s
x86_64-unknown-linux-gnu/gcc (Release)	17m 28s
x86_64-unknown-linux-gnu/clang (Debug)	7m 42s
x86_64-unknown-linux-gnu/clang (Release)	13m 38s
aarch64-unknown-linux-gnu/gcc (Debug)	1h 11m 49s
aarch64-unknown-linux-gnu/gcc (Release)	36m 33s
aarch64-unknown-linux-gnu/clang (Debug)	1h 6m 38s
aarch64-unknown-linux-gnu/clang (Release)	37m 43s
	7h 56m 18s

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