[Bug target/90178] [9 Regression] Missed optimization: duplicated terminal basic block with -mavx

[jakub at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=90178
Bug 90178 depends on bug 90257, which changed state.

Bug 90257 Summary: [10 Regression] 8% degradation on cpu2006 403.gcc starting 
with r270484
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=90257

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