[ARC] Provide an interface to decode ARC instructions.

[ARC] Provide an interface to decode ARC instructions.

gas/
2017-02-06  Claudiu Zissulescu  <claziss@synopsys.com>

	* config/tc-arc.c (parse_opcode_flags): Ignore implicit flags.

include/
2017-02-06  Claudiu Zissulescu  <claziss@synopsys.com>
	    Anton Kolesov  <anton.kolesov@synopsys.com>

	* opcode/arc.h (insn_class_t): Add ENTER, LEAVE, POP, PUSH, BBIT0,
	BBIT1, BI, BIH, BRCC, EI, JLI, and SUB instruction classes.
	(flag_class_t): Add F_CLASS_WB, F_CLASS_ZZ, and F_CLASS_IMPLICIT
	flag classes.

opcode/
2017-02-06  Claudiu Zissulescu  <claziss@synopsys.com>
	    Anton Kolesov  <anton.kolesov@synopsys.com>

	* arc-dis.c (arc_disassemble_info): New structure.
	(init_arc_disasm_info): New function.
	(find_format_from_table): Ignore implicit flags.
	(find_format): Update dissassembler private data.
	(print_flags): Likewise.
	(print_insn_arc): Likewise.
	(arc_opcode_to_insn_type): Consider the new added instruction
	classes.
	(arcAnalyzeInstr): Remove.
	(arc_insn_decode): New function.
	* arc-dis.h (arc_ldst_writeback_mode): New enum.
	(arc_ldst_data_size): Likewise.
	(arc_condition_code): Likewise.
	(arc_operand_kind): Likewise.
	(arc_insn_kind): New struct.
	(arc_instruction): Likewise.
	(arc_insn_decode): Declare function.
	(ARC_Debugger_OperandType): Deleted.
	(Flow): Likewise.
	(NullifyMode): Likewise.
	(allOperandsSize): Likewise.
	(arcDisState): Likewise.
	(arcAnalyzeInstr): Likewise.
	* arc-dis.c (arc_opcode_to_insn_type): Handle newly introduced
	insn_class_t enums.
	* arc-opc.c (F_SIZED): New define.
	(C_CC_EQ, C_CC_GE, C_CC_GT, C_CC_HI, C_CC_HS): Likewise.
	(C_CC_LE, C_CC_LO, C_CC_LS, C_CC_LT, C_CC_NE): Likewise.
	(C_CC_NE, C_AA_AB, C_AA_AW, C_ZZ_D, C_ZZ_H, C_ZZ_B): Likewise.
	(arc_flag_classes): Add F_CLASS_COND/F_CLASS_IMPLICIT flags.
	* opcodes/arc-tbl.h: Update instructions to include new
	F_CLASS_IMPLICIT flags.
	(bbit0, lp): Change class.
	(bbit1, bi, bih, br*, ei_s, jli_s): Likewsie