[C++ PATCH] improve loopkup_base

[Nathan Sidwell]

This speeds up lookup_base by about 1/3% on the qt library.

booted & tested on i686-pc-linux-gnu.

nathan
-- 
Nathan Sidwell    ::   http://www.codesourcery.com   ::     CodeSourcery LLC
nathan@codesourcery.com    ::     http://www.planetfall.pwp.blueyonder.co.uk

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