assert infrastructure for runtime

[Nathan Sidwell]

This patch adds gcc_assert infrastructure for the runtime support
libraries.  It adds a --enable-checking=runtime configure option, which
is enabled by default and with --enable-checking=release.  It is disabled
with --enable-checking=none (this latter case will be a change from
the current situation).

The nice thing about this, is we can then use gcc_assert *everywhere*.
In gcov's case we have a library that is in the compiler, runtime and
utilities  -- it would be neat to unify its assert #defines.

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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