delete more unused Xtensa GAS code

[Bob Wilson]

This patch deletes an unused field and an unused function.  Tested with an 
xtensa-elf target and committed.

gas/
	* config/xtensa-istack.h (struct tinsn_struct): Delete fixup field.
	(tinsn_get_tok): Delete prototype.
	* config/tc-xtensa.c (tinsn_get_tok): Delete.

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