[llvm] [InstCombine] Add fold for fabs(-x) -> fabs(x) (PR #94183)

[via llvm-commits]

VaibhavRumale wrote:

> @VaibhavRumale Please don't update your branch if there is no merge conflict. See https://llvm.org/docs/GitHub.html#rebasing-pull-requests-and-force-pushes

Thanks for sharing the guide. It seems like I made a mistake of committing from my main branch. Can I create a new PR with my new changes, as I know we cannot use forced commits?

https://github.com/llvm/llvm-project/pull/94183