[dataflow]: PATCH COMMITTED to clean up some loose ends.

[Kenneth Zadeck]

This patch fixes two issues noticed by two people who I do not believe
have assignments.  However, both are below the 10 line limit. 

The first patch fixes an issue that effects arm bootstrapping.  The
dataflow branch is not supposed to have reg_unused notes for scratch
registers.  This patch keeps combine from generating them.   The
original patch was from Ramana Radhakrishnan and has been modified
according to Iant's comments.

The second patch fixes a simple problem noticed by Serge Belyshev when
he was playing with a dying alpha at his university.  While I believe
that this makes the alpha bootstrap, it still had regression failures on
the branch. 

2007-05-05  Ramana Radhakrishnan <ramana.r@gmail.com>
        Serge Belyshev  <belyshev@depni.sinp.msu.ru>
        Kenneth Zadeck <zadeck@naturalbridge.com>

    * combine.c (recog_for_combine): Keep unused notes from being
generated for
    scratch registers.
    * config/alpha/alpha.c: Add include for df.h.
   
Kenny

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