lto-symtab.c (lto_symtab_merge_symbols): Populate symtab hashtable.

	* lto-symtab.c (lto_symtab_merge_symbols): Populate symtab hashtable.
	* cgraph.h (varpool_create_empty_node): Declare.
	* lto-cgraph.c (input_node, input_varpool_node): Forcingly create
	duplicated nodes.
	* symtab.c (symtab_unregister_node): Be lax about missin entries
	in node hash.
	(symtab_get_node): Update comment.
	* varpool.c (varpool_create_empty_node): Break out from ...
	(varpool_node_for_decl): ... here.
	* lto-streamer.h (lto_file_decl_data): Add RESOLUTION_MAP.

	* lto.c (register_resolution): Take lto_file_data argument.
	(lto_register_var_decl_in_symtab,
	lto_register_function_decl_in_symtab): Update.
	(read_cgraph_and_symbols): Update resolution_map handling.

From-SVN: r199990