[Committed/Obvious] Fix PR 49474: ICE on ppc-linux with -O3 in cprop.c

[Andrew Pinski]

Hi,
  The problem here is the code reads:
       /* Check for more than one successor.  */
     if (! EDGE_COUNT (bb->succs) > 1)
But that expression is always false as ! has a higher precedence than
> does.  So the obvious thing is to rewrite this statement as:
  if (EDGE_COUNT (bb->succs) <= 1)
And that fixes the problem.  The only case where this case matters is
with __builtin_unreachable as fis_get_condition will return null for
all other cases where there are only one successor edge and we check
that result.

Committed as obvious after a bootstrap/test on x86_64-linux-gnu.

Thanks,
Andrew Pinski

ChangeLog: