[Bug tree-optimization/91687] Fused multiply subtract not generated when same operand appears in multiplication and subtraction and -ffast-math

[pinskia at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=91687
Bug 91687 depends on bug 86999, which changed state.

Bug 86999 Summary: missed FMA optimization with -fassociative-math
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=86999

           What    |Removed                     |Added
----------------------------------------------------------------------------
             Status|NEW                         |RESOLVED
         Resolution|---                         |DUPLICATE