Add dwarf2 support in Xtensa port of gas

[Bob Wilson]

This patch adds support for dwarf2 line number information in the Xtensa port 
of gas.  I built the xtensa-elf target, ran the gas testsuite and verified 
that I could single-step by assembly source lines in gdb.  Committed on the 
mainline.

2003-11-19  Bob Wilson  <bob.wilson@acm.org>

        * config/tc-xtensa.c (xg_emit_insn): Include "dwarf2dbg.h" and add
        call to dwarf2_emit_insn.

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