graphite-isl-ast-to-gimple.c (translate_pending_phi_nodes): Verify both BBs contain loop PHI nodes before dispatching to copy_loop_phi_args.

2017-09-21  Richard Biener  <rguenther@suse.de>

	* graphite-isl-ast-to-gimple.c (translate_pending_phi_nodes):
	Verify both BBs contain loop PHI nodes before dispatching to
	copy_loop_phi_args.
	(graphite_regenerate_ast_isl): Do not recompute dominators,
	do not verify three times.  Restructure for clarity.
	* graphite-scop-detection.c (same_close_phi_node,
	remove_duplicate_close_phi, make_close_phi_nodes_unique,
	defined_in_loop_p, canonicalize_loop_closed_ssa,
	canonicalize_loop_closed_ssa_form): Simplify, remove excess
	checking and SSA rewrite, move to ...
	* graphite.c: ... here.  Include ssa.h and tree-ssa-loop-manip.h.
	(graphite_initialize): Do not pass in ctx, do not reset the
	SCEV cache, compute only dominators.
	(graphite_transform_loops): Allocate ISL ctx after
	graphite_initialize.  Call canonicalize_loop_closed_ssa_form.
	Maintain post-dominators only around build_scops.
	* sese.c (if_region_set_false_region): Make static.  Free
	and recompute dominators.
	(move_sese_in_condition): Assert we don't get called with
	post-dominators computed.
	* sese.h (if_region_set_false_region): Remove.

From-SVN: r253090