* decl2.c (defer_fn): Set DECL_DEFER_OUTPUT.
	(finish-file): Do not process function with DECL_DEFER_OUTPUT clear;
	clear DECL_DEFER_OUTPUT once function is processed; avoid flags
	massaging.

	* cp-tree.h (DECL_NEEDED_P): Support unit-at-a-time
	(expand_or_defer_fn): Declare.
	(lower_function): Declare.
	* decl.c (start_cleanup_fn): Use expand_or_defer_fn.
	* decl2.c: Include cgraph.h and varpool.h
	(maybe_emit_vtables):  Make explicit instantations as needed.
	(mark_member_pointers, lower_function): New functions.
	(finish_file): Do unit-at-a-time.
	* method.c (synthesize_method): Use expand_or_defer_fn.
	* optimize.c (maybe_clone_body): Use expand_or_defer_fn.
	* parser.c (cp_parser_function_definition_after_decl): Use
	expand_or_defer_fn.
	* pt.c (instantiate_decl): Likewise.
	* semantics.c: Include cgraph.h
	(expand_or_defer_fn): Break out from ...
	(expand_body): ... here; deal with unit-at-a-time.
	* cp-lang.c (LANG_HOOKS_CALLGRAPH_EXPAND_FUNCTION,
	LANG_HOOKS_CALLGRAPH_LOWER_FUNCTION): Define.

From-SVN: r68801