fix incorrect DWARF2 line numbers for Xtensa

[Bob Wilson]

DWARF2 line numbers generated by the Xtensa port of GAS were broken because of a 
subtraction that should have been an addition.  Fixed on mainline with the 
following patch.

2005-05-20  Bob Wilson  <bob.wilson@acm.org>

	* config/tc-xtensa.c (xg_assemble_vliw_tokens): Change subtraction
	to addition in argument to xtensa_dwarf2_emit_insn.

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