[Bug tree-optimization/91425] Ordered compares aren't optimised

[pinskia at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=91425
Bug 91425 depends on bug 126138, which changed state.

Bug 126138 Summary: `fp0 == fp1 || fp0 CMP fp1` can be combined always even with trapping
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=126138

           What    |Removed                     |Added
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             Status|ASSIGNED                    |RESOLVED
         Resolution|---                         |FIXED