ifu: reconsider prediction of prevHalfInstr
     now we do not need to gather meta from the last packet
     because we update with packet, thus updating in the
     correct slot

1. divide into three block
2. change io port:
  broadcastUop -> fastUopsIn
  selectUop    -> fastUopOut
  extraPorts   -> slowPorts
  etc.
the cross sub block io is not wrapped, to it later

AMO should choose the right word.

* Now we use a full cycle to get a copy of data from buffer

one can choose by use specified policy name such as "plru"