[Bug middle-end/66313] Unsafe factorization of a*b+a*c

[rguenth at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=66313
Bug 66313 depends on bug 81082, which changed state.

Bug 81082 Summary: [8 Regression] Failure to vectorise after reassociating index computation
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=81082

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