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Auto merge of #126852 - scottmcm:more-checked-math-tweaks, r=Amanieu
Also get `add nuw` from `uN::checked_add` When I was doing this for `checked_{sub,shl,shr}`, it was mentioned #124114 (comment) that it'd be worth trying for `checked_add` too. It makes a particularly-big difference for `x.checked_add(C)`, as doing this means that LLVM removes the intrinsic and does it as a normal `x <= MAX - C` instead. cc `@DianQK` who had commented about `checked_add` related to rust-lang/hashbrown#509 before cc llvm/llvm-project#80637 for how LLVM is unlikely to do this itself
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