arc/nps400: Validate address type operands correctly

arc/nps400: Validate address type operands correctly

When we match against an address type operand within an instruction it
is important that we match exactly the right address type operand early
on, during the opcode selection phase.  If we wait until the operand
insertion phase to check that we have the correct address operand, then
it is too late to select an alternative opcode.  This becomes important
only when we have multiple opcodes with the same mnemonic, and operand
lists that differ only in the type of the address operands.

This commit fixes this issue, and adds some example instructions that
require this issue to be fixed (the instructions are identical except
for the address type operand).

gas/ChangeLog:

	* config/tc-arc.c (find_opcode_match): Use insert function to
	validate matching address type operands.
	* testsuite/gas/arc/nps400-10.d: New file.
	* testsuite/gas/arc/nps400-10.s: New file.

opcodes/ChangeLog:

	* arc-opc.c (arc_flag_operands): Add F_DI14.
	(arc_flag_classes): Add C_DI14.
	* arc-nps400-tbl.h: Add new exc instructions.