[NDS32] Refine bit-wise operation and shift patterns.

[NDS32] Refine bit-wise operation and shift patterns.

gcc/
	* config/nds32/iterators.md (shift_rotate): New code iterator.
	(shift): New code attribute.
	* config/nds32/nds32-md-auxiliary.c (nds32_expand_constant): New.
	* config/nds32/nds32-protos.h (nds32_expand_constant): Declare.
	* config/nds32/nds32.c (nds32_print_operand): Deal with more cases.
	* config/nds32/nds32.md (addsi3, *add_srli): Refine implementation for
	bit-wise operations.
	(andsi3, *andsi3): Ditto.
	(iorsi3, *iorsi3, *or_slli, *or_srli): Ditto.
	(xorsi3, *xorsi3, *xor_slli, *xor_srli): Ditto.
	(<shift>si3, *ashlsi3, *ashrsi3, *lshrsi3, *rotrsi3): Ditto.
	* config/nds32/predicates.md (nds32_rimm5u_operand, nds32_and_operand,
	nds32_ior_operand, nds32_xor_operand): New predicates.

Co-Authored-By: Chung-Ju Wu <jasonwucj@gmail.com>
From-SVN: r259117