gh-151289: optimize shrinking wide int subtraction #3408

Job	Run time
aarch64-apple-darwin/clang	9m 58s
x86_64-apple-darwin/clang	13m 49s
aarch64-unknown-linux-gnu/gcc	6m 26s
x86_64-unknown-linux-gnu/gcc	9m 46s
x86_64-unknown-linux-gnu/gcc-free-threading	7m 0s
	46m 59s

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