fix Xtensa GAS problem with multi-slot instructions

[Bob Wilson]

This patch fixes a problem in the Xtensa port of GAS that only shows up with 
multi-slot instructions.  For relaxation, the code had been looking at expansion 
associated only with the first slot of each instruction, but other slots may 
also cause expansion.

Tested with an xtensa-elf target.  Committed on the mainline.


2004-11-05  Sterling Augustine  <sterling@tensilica.com>

         * config/tc-xtensa.c (total_frag_text_expansion): New.
         (md_estimate_size_before_relax): Use it.
         (find_address_of_next_align_frag): Likewise.

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