[SelectionDAG] Allow FREEZE to be hoisted before FP SETCC. (#84358)

No nans/infs in SelectionDAG is complicated. Hopefully I've captured
all of the cases. I've only applied to ConsiderFlags to the SDNodeFlags
since those are the only ones that will be droped by hoisting. The
condition code and TargetOptions would still be in effect.
    
Recovers some regression from #84232.