[llvm] [AMDGPU][DAGCombiner][GlobalISel] Prevent FMA contraction when multiply cannot be eliminated (PR #169735)

[Adel Ejjeh via llvm-commits]

adelejjeh wrote:

@arsenm

>  Can you do this one instance at a time?

Do you mean separate DAGCombiner and SelectionDAG changes into separate PRs or break it up into multiple small PRs that each handle one def/use pattern?

https://github.com/llvm/llvm-project/pull/169735