[Bug tree-optimization/80158] [7 Regression] ICE in all_phi_incrs_profitable

["wschmidt at gcc dot gnu.org" <gcc-bugzilla at gcc dot gnu dot org>]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=80158

--- Comment #10 from Bill Schmidt <wschmidt at gcc dot gnu.org> ---
Pretty certain the problem is in this chunk:

      if (bump == 0)
        {
          tree lhs = gimple_assign_lhs (c->cand_stmt);
          gassign *copy_stmt = gimple_build_assign (lhs, basis_name);
          gimple_stmt_iterator gsi = gsi_for_stmt (c->cand_stmt);
          gimple_set_location (copy_stmt, gimple_location (c->cand_stmt));
          gsi_replace (&gsi, copy_stmt, false);
          c->cand_stmt = copy_stmt;
          if (dump_file && (dump_flags & TDF_DETAILS))
            stmt_to_print = copy_stmt;
        }

We need a gimple_set_bb (copy_stmt, gimple_bb (c->cand_stmt)) in here if we're
going to rely on the BB information for dominators subsequently.  There may be
other cases like this in the code.