[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 81203, which changed state.

Bug 81203 Summary: [8 Regression] tail recursion: internal compiler error: 
verify_ssa failed
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=81203

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