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

[Jay Foad via llvm-commits]

jayfoad wrote:

LGTM. I see "This pull request is still a work in progress Draft pull requests cannot be merged."

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