[Xtensa] fix obscure assembler relaxation bug

[Bob Wilson]

I've committed this patch from Sterling Augustine to fix a relaxation bug in 
GAS.  The problem can't be reproduced with the default Xtensa processor 
configuration, but I ran the testsuite to make sure the fix doesn't break 
anything else.  Apparently this bug has been latent for years, but it only 
happens for unusual processor configurations.

--Bob

2008-02-05  Sterling Augustine  <sterling@tensilica.com>
	
	* config/tc-xtensa.c (relax_frag_immed): Change internal consistency
	checks into assertions.  When relaxation produces an operation that
	does not fit in the current FLIX instruction, make sure that the
	operation is relaxed as needed to account for being placed following
	the current instruction.
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