[Bug middle-end/67649] trunk build with valgrind fail in get_def_blocks_for

[dcb314 at hotmail dot com]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=67649

--- Comment #2 from David Binderman <dcb314 at hotmail dot com> ---
(In reply to Richard Biener from comment #1)
> You are using -O3 -march=native it seems.  

I checked, and the problem also occurs in the simpler case
when -O3 -march=native is replaced by -O2.

> Note that the error doesn't make much sense to me.

bitmap.h:332 is

  head->first = head->current = NULL;

bitmap.c:286 is

  bitmap_initialize_stat (map, bit_obstack PASS_MEM_STAT);

tree-into-ssa.c:489 is

     db_p->def_blocks = BITMAP_ALLOC (&update_ssa_obstack);