Optimize the use of splay in gbincore().  During a "make buildworld" the desired buffer is found at one of the roots more than 60% of the time. Thus, checking both roots before performing either splay eliminates unnecessary splays on the first tree splayed.
Optimize the use of splay in gbincore().  During a "make buildworld" the
desired buffer is found at one of the roots more than 60% of the time.
Thus, checking both roots before performing either splay eliminates
unnecessary splays on the first tree splayed.

Approved by:	re (jhb)

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