Add ALIGNOF

[Nathan Sidwell]

This patch adds an ALIGNOF linker script operator.  It returns the alignment of 
an output section.

This is needed for upcoming vxworks __thread support, which is implemented in a 
target independent fashion that avoids any existing TLS support such a target 
might have.

ok?

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

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