[Bug rtl-optimization/68274] __builtin_unreachable pessimizes code

[rguenth at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=68274
Bug 68274 depends on bug 102008, which changed state.

Bug 102008 Summary: [12 Regression] no cmov generated for loads next to each other
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=102008

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