[Bug tree-optimization/82255] Vectorizer cost model overcounts cost of some vectorized loads

[wschmidt at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=82255

--- Comment #1 from Bill Schmidt <wschmidt at gcc dot gnu.org> ---
Created attachment 42206
  --> https://gcc.gnu.org/bugzilla/attachment.cgi?id=42206&action=edit
Patch under test

Here's a patch I'm testing.  It solves the problem for this test case but
hasn't been regstrapped yet.