mn10300: crash/bug-fix with linker relaxations

[Alexandre Oliva]

I've run into a problem with linker relaxations on AM33.  Some
sections whose contents were requested for had section->contents ==
NULL.  I'm not sure whether this can happen in GNU binutils (the Red
Hat internal version on which I've observed the problem has a number
of yet-to-be-contributed changes), but still, this change may be a
significant optimization, so I'm contributing it earlier.  Eric
Christopher has already approved this patch, so I'm checking it in the
branch and mainline.

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-- 
Alexandre Oliva   Enjoy Guarana', see http://www.ic.unicamp.br/~oliva/
Red Hat GCC Developer                  aoliva@{cygnus.com, redhat.com}
CS PhD student at IC-Unicamp        oliva@{lsd.ic.unicamp.br, gnu.org}
Free Software Evangelist                Professional serial bug killer