gh-126868: Add freelist for compact int objects #2345

Job	Run time
Interpreter (Debug)	7m 42s
Free-Threaded (Debug) (19)	11m 48s
i686-pc-windows-msvc/msvc (Debug)	18m 42s
i686-pc-windows-msvc/msvc (Release)	10m 54s
x86_64-pc-windows-msvc/msvc (Debug)	18m 14s
x86_64-pc-windows-msvc/msvc (Release)	11m 16s
aarch64-pc-windows-msvc/msvc (Debug)	5m 5s
aarch64-pc-windows-msvc/msvc (Release)	6m 42s
x86_64-apple-darwin/clang (Debug)	12m 56s
x86_64-apple-darwin/clang (Release)	8m 44s
aarch64-apple-darwin/clang (Debug)	9m 18s
aarch64-apple-darwin/clang (Release)	5m 58s
x86_64-unknown-linux-gnu/gcc (Debug)	9m 35s
x86_64-unknown-linux-gnu/gcc (Release)	5m 43s
aarch64-unknown-linux-gnu/gcc (Debug)	8m 42s
aarch64-unknown-linux-gnu/gcc (Release)	6m 59s
	2h 38m 18s

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