[llvm] Added ISD::FMAXIMUM/ISD::FMINIMUM + ISD::FMAXIMUMNUM/ISD::FMINIMUMNUM (PR #190465)

[Simon Pilgrim via llvm-commits]

RKSimon wrote:

> @RKSimon could you point me to any file i can use as a reference for denormal test coverage, i am kind of confuse on how tests should cover different modes like FTZ/DAZ ?

A good trick to try would be to disable the minmax cases in valuetracking, run `ninja check-llvm-transforms` and `ninja check-llvm-analysis`, see what tests change in that implementation and review how that test IR worked

https://github.com/llvm/llvm-project/pull/190465