[llvm] [InstCombine] Fold select pattern with sub and negation to abs intrinsic (PR #156246)

[Yingwei Zheng via llvm-commits]

https://github.com/dtcxzyw approved this pull request.

LG w/ some nits. Please avoid force-pushing your branch, unless you need to rebase on top of other commits... The two-commit history is not enforced.


https://github.com/llvm/llvm-project/pull/156246