[Bug middle-end/65330] restrict should be considered when folding through references from global vars

[rguenth at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=65330
Bug 65330 depends on bug 65270, which changed state.

Bug 65270 Summary: [5 regression] issues with merging memory accesses from 
different code paths
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=65270

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