another minor Xtensa cleanup

[Bob Wilson]

There is an initialization function for Xtensa "tinsn" structures in GAS, but in 
some places, memset was being used to clear them instead.  If we're going to 
have such a function, we might as well use it.  Tested with an xtensa-elf build 
and committed.

gas/
	* config/tc-xtensa.c (xg_build_to_insn): Use tinsn_init.
	(xg_expand_assembly_insn, istack_push_space, istack_pop): Likewise.

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