Add imports and strengthen the export definition in range_def and gori_map.

All add up to 2 direct dependencies for each ssa-name.
Add gori import/export iterators.

	* gimple-range-gori.cc (range_def_chain::range_def_chain): init
	bitmap obstack.
	(range_def_chain::~range_def_chain): Dispose of obstack rather than
	each individual bitmap.
	(range_def_chain::set_import): New.
	(range_def_chain::get_imports): New.
	(range_def_chain::chain_import_p): New.
	(range_def_chain::register_dependency): Rename from build_def_chain
	and set imports.
	(range_def_chain::def_chain_in_bitmap_p): New.
	(range_def_chain::add_def_chain_to_bitmap): New.
	(range_def_chain::has_def_chain): Just check first depenedence.
	(range_def_chain::get_def_chain): Process imports, use generic
	register_dependency routine.
	(range_def_chain::dump): New.
	(gori_map::gori_map): Allocate import list.
	(gori_map::~gori_map): Release imports.
	(gori_map::exports): Check for past allocated block size.
	(gori_map::imports): New.
	(gori_map::def_chain_in_export_p): Delete.
	(gori_map::is_import_p): New.
	(gori_map::maybe_add_gori): Handle imports.
	(gori_map::dump): Adjust output, add imports.
	(gori_compute::has_edge_range_p): Remove def_chain_in_export call.
	(gori_export_iterator::gori_export_iterator): New.
	(gori_export_iterator::next): New.
	(gori_export_iterator::get_name): New.
	* gimple-range-gori.h (range_def_chain): Add imports and direct
	dependecies via struct rdc.
	(range_def_chain::depend1): New.
	(range_def_chain::depend2): New.
	(class gori_map): Adjust.
	(FOR_EACH_GORI_IMPORT_NAME): New.
	(FOR_EACH_GORI_EXPORT_NAME): New.
	(class gori_export_iterator): New.

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