[C++ PATCH]: Fix 13387

[Nathan Sidwell]

Mark,
this fixes 13387 where we were clobbering the tail padding parts of a base
object. Fixed by using CLASSTYPE_AS_BASE, when that has a different size.

booted & tested on i686-pc-linux-gnu, ok?

nathan
-- 
Nathan Sidwell    ::   http://www.codesourcery.com   ::     CodeSourcery LLC
          The voices in my head said this was stupid too
nathan@codesourcery.com    ::     http://www.planetfall.pwp.blueyonder.co.uk

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