const runtime.traceBlockSynctest

4 uses

	runtime (current package)
		synctest.go#L218: 		gopark(synctestidle_c, nil, waitReasonSynctestRun, traceBlockSynctest, 0)
		synctest.go#L298: 	gopark(synctestwait_c, nil, waitReasonSynctestWait, traceBlockSynctest, 0)
		traceruntime.go#L107: 	traceBlockSynctest
		traceruntime.go#L127: 	traceBlockSynctest:           "synctest",