[clang] [llvm] [InstCombine] fold float clamp pattern into llvm.max/min (PR #159652)

[Vedant Paranjape via cfe-commits]

VedantParanjape wrote:

> This is a canonicalize introducing transformation. If %arg0 is a denormal, and the transformed result will be flushed but it wouldn't in the original

that's a fair point, I was not aware of this while working. Will having a flush-all attribute on this instruction guarantee FTZ even in the backend?

https://github.com/llvm/llvm-project/pull/159652