* loop-unroll.c (decide_unroll_constant_iterations,
	decide_unroll_runtime_iterations, decide_unroll_stupid): Use
	likely upper bounds.
	* loop-iv.c (find_simple_exit): Dump likely upper bounds.

	* gcc.dg/unroll-6.c: Update template.
	* gcc.dg/unroll-7.c: New testcase.
	* gcc.dg/unroll-8.c: New testcase.

From-SVN: r236986