add test for Xtensa dwarf2 debug_line assembler support

[Bob Wilson]

This patch adds xtensa-*-* to the list of targets for which the assembler might 
support dwarf2 debug_line information.  I tested this by building an xtensa-elf 
target, running the testsuite, and verifying by hand that GCC now generates .loc 
directives when the assembler supports them.  Committed on the mainline.


2003-11-20  Bob Wilson  <bob.wilson@acm.org>

	* configure.in: Add xtensa-*-* targets to test for dwarf2 debug_line.
	* configure: Regenerate.


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