gh-151289: specialize shrinking int subtraction #3409

Job	Run time
aarch64-unknown-linux-gnu/gcc	6m 44s
x86_64-apple-darwin/clang	22m 34s
x86_64-unknown-linux-gnu/gcc	10m 47s
x86_64-unknown-linux-gnu/gcc-free-threading	8m 3s
aarch64-apple-darwin/clang	9m 42s
	57m 50s

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