[Bug tree-optimization/64121] [5 Regression] ICE: SSA corruption with -O -fsanitize=undefined

[jakub at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=64121

--- Comment #6 from Jakub Jelinek <jakub at gcc dot gnu.org> ---
Ah, indeed.  So perhaps better replace the:
1565        base = gimple_assign_rhs1 (def_stmt);
line in the loop with
{
  tree rhs1 = gimple_assign_rhs1 (def_stmt);
  if (TREE_CODE (rhs1) == SSA_NAME && SSA_NAME_OCCURS_IN_ABNORMAL_PHI (rhs1))
    break;
  else
    base = rhs1;
}
or so?