[NDS32] Refine implementation of sibcall patterns.

[NDS32] Refine implementation of sibcall patterns.

gcc/
	* config/nds32/nds32-md-auxiliary.c (nds32_long_call_p): New function.
	* config/nds32/nds32-protos.h (nds32_long_call_p): Declare.
	* config/nds32/nds32.c (nds32_function_ok_for_sibcall): New function.
	(TARGET_FUNCTION_OK_FOR_SIBCALL): Define.
	* config/nds32/nds32.md (sibcall_internal): New.
	(sibcall_register): Remove.
	(sibcall_immediate): Remove.
	(sibcall_value_internal): New.
	(sibcall_value_register): Remove.
	(sibcall_value_immediate): Remove.
	* config/nds32/predicates.md (nds32_general_register_operand): New.
	(nds32_call_address_operand): New.

Co-Authored-By: Kito Cheng <kito.cheng@gmail.com>
From-SVN: r259065