PR middle-end/16460

	* cgraph.c (cgraph_unnest_node): New function.
	(c_finalize): Rename to ....
	(c_warn_unused_result_recursivly): ... this one; do only the warning
	(finish_function): Finalize the toplevel function; do not lower nested tree.
	* cgraph.h (cgraph_unnest_node): Declare.
	* cgraphunit.c (decide_is_function_needed): Do not use cgraph
	nestedness datastructure.
	* cse.c (cse_insn): Do not cprop nonlocal LABEL_REFs.
	* reload1.c (set_label_offsets): Fix call of set_label_offsets.
	* tree-nested.c (finlize_nesting_tree_1):  Use un-nesting code.

	* utils.c (gnat_finalize): Remove.
	(end_subprog_body): Directly call cgraph_finalize_function;
	do not lower the nested functions.

	* trans-decl.c (build_entry_thunks): Finalize the function; do not lower
	tree.
	(gfc_generate_function_code): Likewise.

From-SVN: r87770