re PR debug/12389 ([testcase needed] ICE in gen_subprogram_die for nested function)

	PR debug/12389
	* Makefile.in (dwarf2out.o): Depend on cgraph.h.
	* cgraph.c (cgraph_function_possibly_inlined_p): New function.
	* cgraph.h (cgraph_function_possibly_inlined_p): Declare.
	(cgraph_global_info): Add flag inlined
	* dwarf2out.c (gen_subprogram_die, gen_decl_die): Use
	cgraph_function_possibly_inded_p
	* cgraphunit.c (mark_inline): Set inlined flag.
	* toplev.c (rest_of_decl_compilation): Call outlining_inline_function
	only for possibly inlined functions.
	* c-decl.c (duplicate_decls): Never output abstract DIE representing old
	body of function.

From-SVN: r72795