Remove workarounds for SI-9252
Remove workarounds for SI-9252

SI-9252 is fixed in Scala 2.11.7, special handling for Array[Unit] tags
should be unnecessary now.

PCMNN/scalan-ce,scalan/scalan,scalan/scalan,PCMNN/scalan-ce,PCMNN/scalan-ce,scalan/scalan