[Xtensa Patch] Use custom copy function for vinsns

[Sterling Augustine]

While looking at the performance issues for my last check in, I noticed 
several other performance bottlenecks in the Xtensa port.

I have committed this patch which addresses one of them: vinsns are 
sized for worst case configurations, but the vast majority of 
configurations aren't worst case. The enclosed patch maintains the 
worst-case sizing, but adds a custom copy function for this data 
structure which only copies the actual case, thereby improving 
performance substantially on most configs.

Sterling

2009-08-20  Sterling Augustine  <sterling@jaw.hq.tensilica.com>

	* config/tc-xtensa.c (xg_copy_vinsn): New function.
	(finish_vinsn): Call xg_copy_vinsn.
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