* Makefile.in (lto-compress.o): Add dependency on LTO_STREAMER_H.
	(cgraph.o): Likewise.
	(cgraphunit.o): Likewise.
	* cgraphunit.c: Include lto-streamer.h
	(cgraph_finalize_compilation_unit): Call lto_streamer_hooks_init
	if LTO is enabled.
	* lto-streamer-in.c (unpack_value_fields): Call
	streamer_hooks.unpack_value_fields if set.
	(lto_materialize_tree): For unhandled nodes, first try to
	call lto_streamer_hooks.alloc_tree, if it exists.
	(lto_input_ts_decl_common_tree_pointers): Move reading of
	DECL_INITIAL to lto_streamer_read_tree.
	(lto_read_tree): Call lto_streamer_hooks.read_tree if set.
	(lto_streamer_read_tree): New.
	(lto_reader_init): Rename from lto_init_reader.
	Move initialization code to lto/lto.c.
	* lto-streamer-out.c (pack_value_fields): Call
	streamer_hooks.pack_value_fields if set.
	(lto_output_tree_ref): For tree nodes that are not
	normally indexable, call streamer_hooks.indexable_with_decls_p
	before giving up.
	(lto_output_ts_decl_common_tree_pointers): Move handling
	for FUNCTION_DECL and TRANSLATION_UNIT_DECL to
	lto_streamer_write_tree.
	(lto_output_tree_header): Call streamer_hooks.is_streamable
	instead of lto_is_streamable.
	Call lto_streamer_hooks.output_tree_header if set.
	(lto_write_tree): Call lto_streamer_hooks.write_tree if
	set.
	(lto_streamer_write_tree): New.
	(lto_output): Call lto_streamer_init directly.
	(lto_writer_init): Remove.
	* lto-streamer.c (streamer_hooks): New.
	(lto_streamer_cache_create): Call streamer_hooks.preload_common_nodes
	instead of lto_preload_common_nodes.
	(lto_is_streamable): Move from lto-streamer.h
	(lto_streamer_hooks_init): New.
	(streamer_hooks): New.
	(streamer_hooks_init): New.
	* lto-streamer.h (struct output_block): Forward declare.
	(struct lto_input_block): Likewise.
	(struct data_in): Likewise.
	(struct bitpack_d): Likewise.
	(struct streamer_hooks): Declare.
	(streamer_hooks): Declare.
	(lto_streamer_hooks_init): Declare.
	(lto_streamer_write_tree): Declare.
	(lto_streamer_read_tree): Declare.
	(streamer_hooks_init): Declare.
	(lto_is_streamable): Move to lto-streamer.c

lto/ChangeLog

	* lto.c (lto_init): New.
	(lto_main): Call it.

From-SVN: r174709