[Bug tree-optimization/90978] A suspicious code in df-scan.c since r160348

[marxin at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=90978

--- Comment #1 from Martin Liška <marxin at gcc dot gnu.org> ---
The same can be seen here:

  3615    else
  3616      {
  3617        struct df_scan_problem_data *problem_data
  3618          = (struct df_scan_problem_data *) df_scan->problem_data;
  3619          gcc_unreachable ();
  3620        df->entry_block_defs = BITMAP_ALLOC (&problem_data->reg_bitmaps);
  3621        changed = true;
  3622      }