Assertify xtensa

[Nathan Sidwell]

This patch assertifies the xtensa target files.

I built an i86 hosted xtensa-none-elf cross compiler and libraries, but
I cannot test it as newlib doesn't support xtensa.  Fortunately there
weren't too many aborts, so I'm relatively confident this is correct.

Is anybody able to do more thorough checking?  Is this ok as is?

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

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