The code mistakenly thinks any cond_jump has two successors.  This is
not true if both destinations are the same, as can happen with weird
patterns as in the PR.


	PR rtl-optimization/68182
	* gcc/bb-reorder.c (reorder_basic_blocks_simple): Treat a conditional
	branch with only one successor just like unconditional branches.

From-SVN: r229983