[Bug tree-optimization/67323] Use non-unit stride loads by preference when applicable

[rguenth at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=67323
Bug 67323 depends on bug 66721, which changed state.

Bug 66721 Summary: [6 regression] gcc.target/i386/pr61403.c FAILs
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=66721

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