enable checking for stage1 compiler

[Nathan Sidwell]

This patch builds the stage1 compiler with checking enabled, regardless
of the final compiler's checking status.

The change to ssa_verify is necessary to avoid a comparison failure.
Without it checking compiler and unchecking compilers end up with dominance
graphs with differently ordered child nodes.

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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