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bdc97d1046
Set both `nuw` and `nsw` in slice size calculation There's an old note in the code to do this, and now that [LLVM-C has an API for it](f0b8ff1251/llvm/include/llvm-c/Core.h (L4403-L4408)), we might as well. And it's been there since what looks like LLVM 17de9b6aa341so doesn't even need to be conditional. (There's other places, like `RawVecInner` or `Layout`, that might want to do things like this too, but I'll leave those for a future PR.)
Please read the rustc-dev-guide chapter on Backend Agnostic Codegen.