* doublest.c (NAN): Remove unused define.

	(extract_floating_by_length, deprecated_extract_floating): Remove.
	(store_floating_by_length, deprecated_store_floating): Remove.
	(extract_typed_floating): Do not call extract_floating_by_length.
	(store_typed_floating): Do not call store_floating_by_length.
	(convert_typed_floating): Remove redundant assertions.
	* doublest.h (deprecated_extract_floating): Remove.
	(deprecated_store_floating): Remove.
	* sh64-tdep.c (sh64_register_convert_to_raw): Call
	extract_typed_floating instead of deprecated_extract_floating.