[Xtensa] check for multiple writes to a register

[Bob Wilson]

Some future Xtensa processors will allow instructions that write multiple 
outputs to different registers in a single register file, but it is not legal to 
have an instruction that attempts to write multiple values into one register. 
I've committed this patch from Sterling Augustine to check this condition.

gas/ChangeLog:
2008-11-04  Sterling Augustine  <sterling@tensilica.com>
	
	* config/tc-xtensa.c (tinsn_check_arguments): Check for multiple
	writes to the same register.

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