[patch, nios2] support optional argument to trap instruction

[Sandra Loosemore]

I've checked in this patch to make the assembler know about the optional 
argument to the "trap" instruction.  It is exactly like the optional 
argument to "break", which is already handled; it was just an oversight 
that "trap" didn't DTRT.

Giving credit where credit is due, this patch was suggested by Jeff 
Prothero of Altera.

-Sandra


2013-06-09  Sandra Loosemore  <sandra@codesourcery.com>

	opcodes/
	* nios2-opc.c (nios2_builtin_opcodes): Give "trap" a type-"b"
	argument.

	gas/
	* config/tc-nios2.c (nios2_parse_args):  Allow trap argument to
	omitted.

	gas/testsuite/
	* gas/nios2/trap.s: Add additional test cases for optional
	argument.
	* gas/nios2/trap.d: Likewise.
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