const runtime.traceEvGCSweepBegin

2 uses

	runtime (current package)
		traceevent.go#L68: 	traceEvGCSweepBegin       // GC sweep start [timestamp, stack ID]
		traceruntime.go#L403: 			tl.eventWriter(traceGoRunning, traceProcRunning).commit(traceEvGCSweepBegin, tl.stack(1))