[llvm] [InstCombine] Fold -X / -Y -> X / Y (PR #88422)

[Krzysztof Parzyszek via llvm-commits]

kparzysz wrote:

> I will accept this patch when we meet this pattern in some real-world applications.

If we see it in an actual application, it means that some customer has encountered an optimization opportunity which we missed. Handling potential issues before they happen is a reasonable thing to to.

What concerns do you have with this patch as-is?

https://github.com/llvm/llvm-project/pull/88422