invoke.texi (-fpeel-loops,-O3): Update documentation.

invoke.texi (-fpeel-loops,-O3): Update documentation.

	* doc/invoke.texi (-fpeel-loops,-O3): Update documentation.
	* opts.c (default_options): Enable peel loops at -O3.
	* tree-ssa-loop-ivcanon.c (peeled_loops): New static var.
	(try_peel_loop): Do not re-peel already peeled loops;
	use likely upper bounds; fix profile updating.
	(pass_complete_unroll::execute): Initialize peeled_loops.

	* gcc.dg/tree-ssa/peel1.c: New testcase.
	* gcc.dg/tree-ssa/pr61743-1.c: Disable loop peeling.
	* gcc.dg/tree-ssa/pr61743-2.c: Disable loop peeling.

From-SVN: r236892