Auto merge of #114720 - scottmcm:better-sub, r=workingjubilee

Tell LLVM that the negation in `<*const T>::sub` cannot overflow

Today it's just `sub` <https://rust.godbolt.org/z/8EzEPnMr5>; with this PR it's `sub nsw`.
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bors 2023-08-11 23:40:33 +00:00
commit 66a6e70688

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