Disappearing REG_LABEL notes

[Jeffrey A Law]

  In message < 14123.61880.828165.765810@ongaonga.elec.canterbury.ac.nz >you writ
  > Now I could hack the C4x splitters to copy a REG_LABEL note if needed
  > but this doesn't seem to be the proper solution.  I suppose try_split
  > could be patched to add the note if necessary or a pass could be
  > run over the insns after reload?  Any suggestions as to the best way
  > I should fix this?
Sort term, don't split such insns :-)  Or arrange for the backend to make sure
the label_ref is attached to one of the new instructions.

jeff