[Bug middle-end/114604] New: Ranger allocates from uninitialized bitmap_default_obstack

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

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=114604

            Bug ID: 114604
           Summary: Ranger allocates from uninitialized
                    bitmap_default_obstack
           Product: gcc
           Version: 14.0
            Status: UNCONFIRMED
          Severity: normal
          Priority: P3
         Component: middle-end
          Assignee: unassigned at gcc dot gnu.org
          Reporter: rguenth at gcc dot gnu.org
  Target Milestone: ---

Visible at least from gcc.dg/torture/pr52429.c when instrumenting
bitmap_alloc with

bitmap
bitmap_alloc (bitmap_obstack *bit_obstack MEM_STAT_DECL)
{
  bitmap map;

  if (!bit_obstack)
    {
      gcc_assert (bitmap_default_obstack_depth > 0);
      bit_obstack = &bitmap_default_obstack;

gcc.dg/torture/pr52429.c:24:1: internal compiler error: in bitmap_alloc, at
bitmap.cc:785^M
0xf3d95b bitmap_alloc(bitmap_obstack*)^M
        /home/rguenther/src/trunk/gcc/bitmap.cc:785^M
0x2e89005 update_list::update_list()^M
        /home/rguenther/src/trunk/gcc/gimple-range-cache.cc:900^M
0x2e893a2 ranger_cache::ranger_cache(int, bool)^M
        /home/rguenther/src/trunk/gcc/gimple-range-cache.cc:976^M
0x2e815a9 gimple_ranger::gimple_ranger(bool)^M
        /home/rguenther/src/trunk/gcc/gimple-range.cc:44^M
0x2e83e88 enable_ranger(function*, bool)^M
        /home/rguenther/src/trunk/gcc/gimple-range.cc:693^M
0x13bfd62 ipa_analyze_node(cgraph_node*)^M
        /home/rguenther/src/trunk/gcc/ipa-prop.cc:3191^M