[Bug c++/64191] [4.9/5 Regression] -march=native messes up dead code elimination in loop calling dtor

[jakub at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=64191

--- Comment #7 from Jakub Jelinek <jakub at gcc dot gnu.org> ---
The tree-vect-stmts.c change is fine of course.  As for loops not being DCEd if
they have only clobbers in them that preclude that, isn't that optimized away
by RTL optimizers anyway?  Or perhaps we could do something about in the loop
pipeline, but IMHO changing DCE is too big and too dangerous hammer.