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

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SahilPatidar wrote:

@jayfoad,
I was looking for F.getDenormalType but couldn't find it.  Instead, I tried using F->getDenormalMode(LHSI->getType()->getScalarType()->getFltSemantics()) == DenormalMode::getIEEE(), but I haven't seen any difference in the tests after making the change.

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