Add unroll and jam pass

Add unroll and jam pass

	* gimple-loop-jam.c: New file.
	* Makefile.in (OBJS): Add gimple-loop-jam.o.
	* common.opt (funroll-and-jam): New option.
	* opts.c (default_options_table): Add unroll-and-jam at -O3.
	* params.def (PARAM_UNROLL_JAM_MIN_PERCENT): New param.
	(PARAM_UNROLL_JAM_MAX_UNROLL): Ditto.
	* passes.def: Add pass_loop_jam.
	* timevar.def (TV_LOOP_JAM): Add.
	* tree-pass.h (make_pass_loop_jam): Declare.
	* cfgloop.c (flow_loop_tree_node_add): Add AFTER argument.
	* cfgloop.h (flow_loop_tree_node_add): Adjust declaration.
	* cfgloopmanip.c (duplicate_loop): Add AFTER argument, adjust call
	to flow_loop_tree_node_add.
	(duplicate_subloops, copy_loops_to): Append to sibling list.
	* cfgloopmanip.h: (duplicate_loop): Adjust declaration.
	* doc/invoke.texi (-funroll-and-jam): Document new option.
	(unroll-jam-min-percent, unroll-jam-max-unroll): Document new params.

testsuite/
	* gcc.dg/unroll-and-jam.c: New test.

From-SVN: r255467