tree.c (need_assembler_name_p): Use cgraph_get_node instead of cgraph_node_for_decl.

	* tree.c (need_assembler_name_p): Use cgraph_get_node instead
	of cgraph_node_for_decl.
	* cgraph.h (cgraph_node_for_decl): Remove prototype.
	* cgraph.c (cgraph_node_for_decl): Remove.
	(cgraph_get_node): Just return NULL if !cgraph_hash.

From-SVN: r154329