[Bug tree-optimization/82750] Incorrect code for mednafen's array copy test with -O3

[rguenth at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=82750
Bug 82750 depends on bug 81740, which changed state.

Bug 81740 Summary: [7 Regression] wrong code at -O3 in both 32-bit and 64-bit 
modes on x86_64-linux-gnu
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=81740

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