[Bug tree-optimization/66396] [6 regression] FAIL: gcc.dg/graphite/run-id-pr47593.c execution test

[rguenth at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=66396

--- Comment #6 from Richard Biener <rguenth at gcc dot gnu.org> ---
The issue is corrupted VOPs.

  <bb 2>:
  # .MEM_4 = VDEF <.MEM_3(D)>
  iD.1808@ = 1;
  # .MEM_5 = VDEF <.MEM_4>
  xD.1810@ = &iD.1808@;
  # .MEM_6 = VDEF <.MEM_5>
  yD.1811@ = &jD.1807@;
  # .MEM_7 = VDEF <.MEM_6>
  fD.1806@.pD.1801 = &yD.1811@;
  # .MEM_8 = VDEF <.MEM_7>
  fD.1806@.qD.1802 = &xD.1810@;
  # PT = { D.1806 }
  p_25 = &fD.1806@ + 4;
  # .MEM_28 = VDEF <.MEM_3(D)>
  jD.1807@ = 4;

see how that uses the wrong VUSE.