reimplement tracer to be more resilient to pipeline stalls due to OBI…

Created by: strichmo

… gnt and rvalid stalls

breaks out register file wb and ex updates from pipeline moves tracer class into an include file for code cleanliness add wb_bypass bit to signal that gpr check can be relaxed for branch

This PR must be merged before core-v-verif PR which must point to this: https://github.com/openhwgroup/core-v-verif/pull/279

Signed-off-by: Steve Richmond Steve.Richmond@silabs.com