cleanup some Xtensa code in gas

[Bob Wilson]

This patch should have no functional changes.... just cleaning up a bit.  
Tested with gas testsuite and committed.

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

	* config/tc-xtensa.c (xtensa_mark_literal_pool_location): Remove
	"move_labels" argument and corresponding call to xtensa_move_labels.
	(md_assemble): Add a separate call to xtensa_move_labels and remove
	argument for call to xtensa_mark_literal_pool_location.
	(xtensa_literal_position, xtensa_switch_to_literal_fragment): Fix
	calls to xtensa_mark_literal_pool_location.
	(xtensa_create_local_symbol): Delete and inline the code into...
	(xtensa_create_literal_symbol): ...here.
	(xtensa_frob_label): Combine conditionals.
	(expression_maybe_register, xtensa_symbol_new_hook,
	fix_new_exp_in_seg): Use symbol_get_tc.

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