Add support for .extCondCode, .extCoreRegister and .extAuxRegister.

Add support for .extCondCode, .extCoreRegister and .extAuxRegister.

gas/
2016-04-05  Claudiu Zissulescu  <claziss@synopsys.com>

	* testsuite/gas/arc/textauxregister.d: New file.
	* testsuite/gas/arc/textauxregister.s: Likewise.
	* testsuite/gas/arc/textcondcode.d: Likewise.
	* testsuite/gas/arc/textcondcode.s: Likewise.
	* testsuite/gas/arc/textcoreregister.d: Likewise.
	* testsuite/gas/arc/textcoreregister.s: Likewise.
	* testsuite/gas/arc/textpseudoop.d: Likewise.
	* testsuite/gas/arc/textpseudoop.s: Likewise.
	* testsuite/gas/arc/ld2.d: Update test.
	* testsuite/gas/arc/st.d: Likewise.
	* testsuite/gas/arc/taux.d: Likewise.
	* doc/c-arc.texi (ARC Directives): Add .extCondCode,
	.extCoreRegister and .extAuxRegister documentation.
	* config/tc-arc.c (arc_extcorereg): New function.
	(md_pseudo_table): Add .extCondCode, .extCoreRegister and
	.extAuxRegister pseudo-ops.
	(extRegister_t): New type.
	(ext_condcode, arc_aux_hash): New global variable.
	(find_opcode_match): Check for extensions.
	(preprocess_operands): Likewise.
	(md_begin): Add aux registers in a hash.
	(assemble_insn): Update use arc_flags member.
	(tokenize_extregister): New function.
	(create_extcore_section): Likewise.
	* config/tc-arc.h (MAX_FLAG_NAME_LENGHT): Increase to 10.
	(arc_flags): Delete code, add flgp.

include/
2016-04-05  Claudiu Zissulescu  <claziss@synopsys.com>

	* opcode/arc.h (flag_class_t): Update.
	(ARC_OPCODE_NONE): Define.
	(ARC_OPCODE_ARCALL): Likewise.
	(ARC_OPCODE_ARCFPX): Likewise.
	(ARC_REGISTER_READONLY): Likewise.
	(ARC_REGISTER_WRITEONLY): Likewise.
	(ARC_REGISTER_NOSHORT_CUT): Likewise.
	(arc_aux_reg): Add cpu.

opcodes/
2016-04-05  Claudiu Zissulescu  <claziss@synopsys.com>

	* arc-dis.c (find_format): Check for extension flags.
	(print_flags): New function.
	(print_insn_arc): Update for .extCondCode, .extCoreRegister and
	.extAuxRegister.
	* arc-ext.c (arcExtMap_coreRegName): Use
	LAST_EXTENSION_CORE_REGISTER.
	(arcExtMap_coreReadWrite): Likewise.
	(dump_ARC_extmap): Update printing.
	* arc-opc.c (arc_flag_classes): Add F_CLASS_EXTEND flag.
	(arc_aux_regs): Add cpu field.
	* arc-regs.h: Add cpu field, lower case name aux registers.

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