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

[Yingwei Zheng via llvm-commits]

dtcxzyw 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


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