sh.c (sh_promote_prototypes): Make static.

	* config/sh/sh.c (sh_promote_prototypes): Make static.
	(sh_function_value, sh_libcall_value, sh_function_value_regno_p): New
	functions.
	(TARGET_FUNCTION_VALUE, TARGET_LIBCALL_VALUE): Declare.
	* config/sh/sh.h: (FUNCTION_VALUE_REGNO_P): Redefine, use
	sh_function_value_regno_p.
	(FUNCTION_VALUE, LIBCALL_VALUE): Remove.
	* config/sh/sh-protos.h (sh_function_value_regno_p): Declare.
	(sh_promote_prototypes) : Remove.

From-SVN: r154842