[ARC] Add checking for LP_COUNT reg usage, improve error reporting.

[ARC] Add checking for LP_COUNT reg usage, improve error reporting.

gas/
2016-11-29  Claudiu Zissulescu  <claziss@synopsys.com>

	* config/tc-arc.c (find_opcode_match): New function argument
	errmsg.
	(assemble_tokens): Collect and report the eventual error message
	found during opcode matching process.
	* testsuite/gas/arc/lpcount-err.s: New file.
	* testsuite/gas/arc/add_s-err.s: Update error message.

opcode/
2016-11-29  Claudiu Zissulescu  <claziss@synopsys.com>

	* arc-opc.c (insert_ra_chk): New function.
	(insert_rb_chk): Likewise.
	(insert_rad): Update text error message.
	(insert_rcd): Likewise.
	(insert_rhv2): Likewise.
	(insert_r0): Likewise.
	(insert_r1): Likewise.
	(insert_r2): Likewise.
	(insert_r3): Likewise.
	(insert_sp): Likewise.
	(insert_gp): Likewise.
	(insert_pcl): Likewise.
	(insert_blink): Likewise.
	(insert_ilink1): Likewise.
	(insert_ilink2): Likewise.
	(insert_ras): Likewise.
	(insert_rbs): Likewise.
	(insert_rcs): Likewise.
	(insert_simm3s): Likewise.
	(insert_rrange): Likewise.
	(insert_fpel): Likewise.
	(insert_blinkel): Likewise.
	(insert_pcel): Likewise.
	(insert_nps_3bit_dst): Likewise.
	(insert_nps_3bit_dst_short): Likewise.
	(insert_nps_3bit_src2_short): Likewise.
	(insert_nps_bitop_size_2b): Likewise.
	(MAKE_SRC_POS_INSERT_EXTRACT_FUNCS): Likewise.
	(RA_CHK): Define.
	(RB): Adjust.
	(RB_CHK): Define.
	(RC): Adjust.
	* arc-dis.c (print_insn_arc): Add LOAD and STORE class.
	* arc-tbl.h (div, divu): All instructions are DIVREM class.
	Change first insn argument to check for LP_COUNT usage.
	(rem): Likewise.
	(ld, ldd): All instructions are LOAD class.  Change first insn
	argument to check for LP_COUNT usage.
	(st, std): All instructions are STORE class.
	(mac, mpy, dmac, mul, dmpy): All instructions are MPY class.
	Change first insn argument to check for LP_COUNT usage.
	(mov): All instructions are MOVE class.  Change first insn
	argument to check for LP_COUNT usage.

include/
2016-11-29  Claudiu Zissulescu  <claziss@synopsys.com>

	* opcode/arc.h (insn_class_t): Add DIVREM, LOAD, MOVE, MPY, STORE
	instruction classes.