GRAN_RESCHEDULE -> nullCosts {- GrAnSim bookkeeping -}
GRAN_FETCH_AND_RESCHEDULE -> nullCosts {- GrAnSim bookkeeping -}
THREAD_CONTEXT_SWITCH -> nullCosts {- GrAnSim bookkeeping -}
+ _ -> trace "Costs.stmtMacroCosts" nullCosts
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