[Bug sanitizer/63520] ICE: in get_biv_step, at loop-iv.c:824 with -fsanitize=undefined on ppc64

[trippels at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=63520

--- Comment #11 from Markus Trippelsdorf <trippels at gcc dot gnu.org> ---
Hmm, the reduced testcase for comment 6 looks almost identical to
the decNumber.i testcase.

trippels@gcc2-power8 gcc % cat coverage.ii
int a;
void
fn1 ()
{
  int b = 2;
  for (; a;)
    while (b >= 0)
      b--;
}
trippels@gcc2-power8 gcc % g++ -c -O2 -fsanitize=undefined coverage.ii
g++: internal compiler error: Segmentation fault (program cc1plus)