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

TODO:
1. fix dispatch
2. support replay in reservation stations
3. refactor lsroq/dcache

The redirect may be speculative and the branch instruction may be replayed.
pnpc should be set to the updated pnpc, the same as the newly-fetched instructions.

Optimization: when the terms in issueQueue have no rdy && enq is
rdy && first stage is empty then send the enq term directly