https://gcc.gnu.org/bugzilla/show_bug.cgi?id=64609

--- Comment #4 from Marek Polacek <mpolacek at gcc dot gnu.org> ---
It's because we get rid of that && 0 prior calling maybe_warn_bool_compare. 
But we warn for

int
fn1 (int a, int b)
{
  return ((a && b) <= 4);
}

warning: comparison of constant ‘4’ with boolean expression is always true

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