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MSHR: set
w_grantlast
only when both response and data are received
The CompAck must only be sent after a CompData or RespSepData (instead of DataSepResp) is received. Therefore `w_grant.*` should be set after RespSepData is received, otherwise CompAck might be sent before RespSepData if RespSepData arrives in RN after DataSepResp. Also, extra logics besides `w_grant.*` are necessary to make sure that Grant upwards is sent only after both response and data are received.
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