[Bug target/64844] [5 Regression] Vectorization inhibited in gcc5 when loop starts with elem[1], aarch64 perf regression from 4.9.1

[rguenth at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=64844

--- Comment #4 from Richard Biener <rguenth at gcc dot gnu.org> ---
Created attachment 34613
  --> https://gcc.gnu.org/bugzilla/attachment.cgi?id=34613&action=edit
patch

Patch I am testing.