gh-145779: Improve classmethod/staticmethod scaling in free-threaded build #2346

Job	Run time
x86_64-pc-windows-msvc/msvc	10m 34s
x86_64-pc-windows-msvc/msvc-free-threading	4m 43s
aarch64-unknown-linux-gnu/gcc	7m 22s
aarch64-apple-darwin/clang	8m 52s
x86_64-unknown-linux-gnu/gcc	9m 51s
x86_64-unknown-linux-gnu/gcc-free-threading	8m 36s
x86_64-apple-darwin/clang	11m 35s
	1h 1m 33s

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