Ftq: save pc and branch infos by fetch packet

Wrap data in Data8Module

L1 DCache Finished

IntToFP: opt timing

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

Opt sbuffer timing

AMO should choose the right word.

Replace policy

difftest: able to show trap info for dual-core