[llvm] [SDAG] Drop select -> fmax/min folding in SelectionDAGBuilder (PR #93575)

[Yingwei Zheng via llvm-commits]

dtcxzyw wrote:

> > @arsenm Have all (potential) regressions been fixed?
> 
> No. We at least should have the nnan cases to minimum/maximum combine handled

@arsenm Ping me after most of the regressions are addressed :)


https://github.com/llvm/llvm-project/pull/93575