comment before ultimate_transparent_alias_target()

[Alexandre Oliva]

GeoffK pointed out I'd failed to add this comment.  Here it is.  I've
checked it in both mainline and 4.1 branch.

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-- 
Alexandre Oliva         http://www.lsd.ic.unicamp.br/~oliva/
Red Hat Compiler Engineer   aoliva@{redhat.com, gcc.gnu.org}
Free Software Evangelist  oliva@{lsd.ic.unicamp.br, gnu.org}