[Bug tree-optimization/71148] [7 Regression] Compile time hog w/ -O3 -funroll-loops

[asolokha at gmx dot com]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=71148

--- Comment #1 from Arseny Solokha <asolokha at gmx dot com> ---
The same issue w/ the following testcase and -O2 -ftracer:

char yt;
int uz, rp, b6;

void
tw (void)
{
  int *ip = &b6;

p9:
  if (b6 / rp != 0)
    {
      for (yt = 0; yt < 2; ++yt)
        {
          if (*ip > b6)
            --rp;
          ip = &uz;
          yt *= (rp & (rp ? b6 : uz));
          if ((1 / b6) != 0)
            if (--yt != 0)
              goto p9;
        }
      goto p9;
      for (yt = 0; yt < 1; ++yt)
        {
gk:
          return;
fj:
          ;
        }
    }
  if (b6 * b6 != 0)
    {
      uz |= rp;
      goto gk;
    }
  goto fj;
}