New pass: loop flattening.

New pass: loop flattening.

2010-09-09  Sebastian Pop  <sebastian.pop@amd.com>

	* Makefile.in (OBJS-common): Add graphite-flattening.o.
	(graphite-flattening.o): New rule.
	* common.opt (floop-flatten): New flag.
	* doc/invoke.texi (-floop-flatten): Documented.
	* graphite-flattening.c: New.
	* graphite-poly.c (apply_poly_transforms): Call flatten_all_loops.
	* graphite-poly.h (flatten_all_loops): Declared.
	(lst_remove_loop_and_inline_stmts_in_loop_father): New.
	* tree-ssa-loop.c (gate_graphite_transforms): When flag_loop_flatten
	is set, also set flag_graphite.

git-svn-id: svn+ssh://gcc.gnu.org/svn/gcc/trunk@164804 138bc75d-0d04-0410-961f-82ee72b054a4