[llvm] [ConstraintElim] Add support for decomposing gep nuw (PR #118639)

[Yingwei Zheng via llvm-commits]

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

LG. At least it improves compile-time.
Alive2: https://alive2.llvm.org/ce/z/hhriF6


https://github.com/llvm/llvm-project/pull/118639