Remove broken nios2 assembler dwim support.

Remove broken nios2 assembler dwim support.

2014-11-28  Sandra Loosemore  <sandra@codesourcery.com>

	include/opcode/
	* nios2.h (NIOS2_INSN_ADDI, NIOS2_INSN_ANDI): Delete.
	(NIOS2_INSN_ORI, NIOS2_INSN_XORI): Delete.
	(NIOS2_INSN_OPTARG): Renumber.

	opcodes/
	* nios2-opc.c (nios2_r1_opcodes): Remove deleted attributes
	from descriptors.

	gas/
	* config/tc-nios2.c (can_evaluate_expr, get_expr_value): Delete.
	(output_addi, output_andi, output_ori, output_xori): Delete.
	(md_assemble): Remove calls to deleted functions.

	gas/testsuite/
	* gas/nios2/nios2.exp: Make "movi" a list test.
	* gas/nios2/movi.s: Adjust comments, add another case.
	* gas/nios2/movi.l: New.
	* gas/nios2/movi.d: Delete.