[llvm] [InstCombine] Fold fcmp ogt (x - y), 0 into fcmp ogt x, y #85245 (PR #85506)

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SahilPatidar wrote:

@jayfoad, I tried setting the `denormal-fp-math` attribute to various options (`positive-zero`, `dynamic,dynamic`, and `preserve-sign`) as you suggested. it seems to be preventing optimizations as you mentioned.

https://github.com/llvm/llvm-project/pull/85506