gas: improve architecture mismatch diagnostics in sparc

gas: improve architecture mismatch diagnostics in sparc

Merely dumping the mnemonic name in "architecture mismatch" errors may
not provide enough information to determine what went wrong, as the same
mnemonic can be used for different variants of an instruction pertaining
to different architecture levels.

This little patch makes the assembler to include the instruction
arguments in the error message.

gas/ChangeLog:

2016-09-14  Jose E. Marchesi  <jose.marchesi@oracle.com>

	* config/tc-sparc.c (sparc_ip): Print the instruction arguments
	in "architecture mismatch" error messages.