[Xtensa] fix corner case in GAS

[Bob Wilson]

I've committed this patch to fix an obscure corner case in the Xtensa port of 
GAS.  If a particular opcode can be encoded in multiple instructions formats 
that are the same size but have different numbers of slots, treat the format 
with the fewest slots as the "narrowest" one.  This is not very likely to come 
up in practice but the assembler should handle it anyway.

2006-04-03  Sterling Augustine  <sterling@tensilica.com>

	* config/tc-xtensa.c (init_op_placement_info_table): Check for formats
	of the same length but different numbers of slots.


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