runtime asserts

[Nathan Sidwell]

Hi,
this patch implements a runtime checking option and associated
assertions.  With this we can proceed to convert the runtime files.

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

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

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