gdb/

gdb/
	Code cleanup.
	* dummy-frame.c (dummy_frame_unwinder): Remove its static qualifier.
	Rename to dummy_frame_unwind.
	(dummy_frame_unwind): Remove.
	* dummy-frame.h (dummy_frame_unwind): Reference directly the struct.
	* frame-unwind.c (frame_unwind_init): Use address of
	dummy_frame_unwind and inline_frame_unwind.
	* frame.c (create_sentinel_frame): Use address of
	sentinel_frame_unwind.
	* inline-frame.c (inline_frame_unwinder): Rename to
	inline_frame_unwind.
	(inline_frame_unwind): Remove.
	* inline-frame.h (inline_frame_unwind): Reference directly the struct.
	* sentinel-frame.c (sentinel_frame_unwinder): Rename to
	sentinel_frame_unwind.
	(sentinel_frame_unwind): Remove.
	* sentinel-frame.h (sentinel_frame_unwind): Reference directly the
	struct.