[Bug target/65660] [5 Regression] 252.eon regression on bdver2 with -Ofast

[rguenth at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=65660

--- Comment #5 from Richard Biener <rguenth at gcc dot gnu.org> ---
https://gcc.gnu.org/ml/gcc-patches/2015-04/msg00053.html

C testcase:

void Set (float d, float *data)
{
  for (int i = 0; i < 8; i++)
    data[i] = d;
}

note that I didn't really verify it is that specific vectorization causing the
slowdown.  It just appears a lot in the diff.  As said we should recognize
that peeling for alignment is stupid here.  Will produce a patch for that as
well.