remove unused Xtensa code in gas

[Bob Wilson]

This patch simply removes some unused code for a feature that was never fully 
completed.  All this code was inside ifdefs for "XTENSA_COMBINE_LITERALS" 
which was never defined.  Perhaps someday this feature will get reimplemented 
but the code here could be easily reproduced if it's needed.

2003-09-09  Bob Wilson  <bob.wilson@acm.org>

        * config/tc-xtensa.c (xtensa_literal_pseudo): Remove code for
        combining identical literals.
        (expression_maybe_register): Remove call to find_lit_sym_translation.
        (is_duplicate_expression, cache_literal, is_duplicate_literal,
        add_lit_sym_translation, find_lit_sym_translation): Delete.


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