[Bug tree-optimization/69820] [6 Regression] Test miscompiled with -O3 option

[trippels at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=69820

--- Comment #5 from Markus Trippelsdorf <trippels at gcc dot gnu.org> ---
knl ICE:

int a[100], b[100];
short c[100];
void fn1() {
  for (int i = 0; i < 100; ++i)
    b[i] = a[i] * (bool)c[i];
}