Add support for .extInstruction pseudo-op.

Add support for .extInstruction pseudo-op.

gas/
2016-04-04  Claudiu Zissulescu  <claziss@synopsys.com>

	* testsuite/gas/arc/textinsn-errors.d: New File.
	* testsuite/gas/arc/textinsn-errors.err: Likewise.
	* testsuite/gas/arc/textinsn-errors.s: Likewise.
	* testsuite/gas/arc/textinsn2op.d: Likewise.
	* testsuite/gas/arc/textinsn2op.s: Likewise.
	* testsuite/gas/arc/textinsn2op01.d: Likewise.
	* testsuite/gas/arc/textinsn2op01.s: Likewise.
	* testsuite/gas/arc/textinsn3op.d: Likewise.
	* testsuite/gas/arc/textinsn3op.s: Likewise.
	* doc/c-arc.texi (ARC Directives): Add .extInstruction
	documentation.
	* config/tc-arc.c (arcext_section): New variable.
	(arc_extinsn): New function.
	(md_pseudo_table): Add .extInstruction pseudo op.
	(attributes_t): New type.
	(suffixclass, syntaxclass, syntaxclassmod): New constant
	structures.
	(find_opcode_match): Remove arc_num_opcodes.
	(md_begin): Likewise.
	(tokenize_extinsn): New function.
	(arc_set_ext_seg): Likewise.
	(create_extinst_section): Likewise.

include/
2016-04-04  Claudiu Zissulescu  <claziss@synopsys.com>

	* opcode/arc.h (arc_num_opcodes): Remove.
	(ARC_SYNTAX_3OP, ARC_SYNTAX_2OP, ARC_OP1_MUST_BE_IMM)
	(ARC_OP1_IMM_IMPLIED, ARC_SUFFIX_NONE, ARC_SUFFIX_COND)
	(ARC_SUFFIX_FLAG): Define.
	(flags_none, flags_f, flags_cc, flags_ccf): Declare.
	(arg_none, arg_32bit_rarbrc, arg_32bit_zarbrc, arg_32bit_rbrbrc)
	(arg_32bit_rarbu6, arg_32bit_zarbu6, arg_32bit_rbrbu6)
	(arg_32bit_rbrbs12, arg_32bit_ralimmrc, arg_32bit_rarblimm)
	(arg_32bit_zalimmrc, arg_32bit_zarblimm, arg_32bit_rbrblimm)
	(arg_32bit_ralimmu6, arg_32bit_zalimmu6, arg_32bit_zalimms12)
	(arg_32bit_ralimmlimm, arg_32bit_zalimmlimm, arg_32bit_rbrc)
	(arg_32bit_zarc, arg_32bit_rbu6, arg_32bit_zau6, arg_32bit_rblimm)
	(arg_32bit_zalimm, arg_32bit_limmrc, arg_32bit_limmu6)
	(arg_32bit_limms12, arg_32bit_limmlimm): Likewise.

opcodes/
2016-04-04  Claudiu Zissulescu  <claziss@synopsys.com>

	* arc-opc.c (flags_none, flags_f, flags_cc, flags_ccf):
	Initialize.
	(arg_none, arg_32bit_rarbrc, arg_32bit_zarbrc, arg_32bit_rbrbrc)
	(arg_32bit_rarbu6, arg_32bit_zarbu6, arg_32bit_rbrbu6)
	(arg_32bit_rbrbs12, arg_32bit_ralimmrc, arg_32bit_rarblimm)
	(arg_32bit_zalimmrc, arg_32bit_zarblimm, arg_32bit_rbrblimm)
	(arg_32bit_ralimmu6, arg_32bit_zalimmu6, arg_32bit_zalimms12)
	(arg_32bit_ralimmlimm, arg_32bit_zalimmlimm, arg_32bit_rbrc)
	(arg_32bit_zarc, arg_32bit_rbu6, arg_32bit_zau6, arg_32bit_rblimm)
	(arg_32bit_zalimm, arg_32bit_limmrc, arg_32bit_limmu6)
	(arg_32bit_limms12, arg_32bit_limmlimm): Likewise.
	(arc_opcode arc_opcodes): Null terminate the array.
	(arc_num_opcodes): Remove.
	* arc-ext.h (INSERT_XOP): Define.
	(extInstruction_t): Likewise.
	(arcExtMap_instName): Delete.
	(arcExtMap_insn): New function.
	(arcExtMap_genOpcode): Likewise.
	* arc-ext.c (ExtInstruction): Remove.
	(create_map): Zero initialize instruction fields.
	(arcExtMap_instName): Remove.
	(arcExtMap_insn): New function.
	(dump_ARC_extmap): More info while debuging.
	(arcExtMap_genOpcode): New function.
	* arc-dis.c (find_format): New function.
	(print_insn_arc): Use find_format.
	(arc_get_disassembler): Enable dump_ARC_extmap only when
	debugging.

Signed-off-by: Claudiu Zissulescu <claziss@synopsys.com>