fix Xtensa assembler for prefixed rsr/xsr/wsr opcodes

[Bob Wilson]

This patch fixes a stupid mistake in the Xtensa port of GAS.  If the RSR/XSR/WSR 
opcodes are used with an underscore prefix (to disable assembler 
transformation), the assembler may add an extra underscore, causing the opcodes 
not to be recognized.  Tested with an xtensa-elf target and committed on the 
mainline.

2006-03-13  Bob Wilson  <bob.wilson@acm.org>

	* config/tc-xtensa.c (xg_translate_sysreg_op): Remove has_underbar
	flag and avoid double underscore prefixes.

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