[Bug tree-optimization/78847] pointer arithmetic from c++ ranged-based for loop not optimized

[rguenth at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=78847

--- Comment #4 from Richard Biener <rguenth at gcc dot gnu.org> ---
Note that the attached patch will actually end up propagating that &MEM form
everywhere (and run into those object-size fallout issues).