const runtime.traceBlockGCSweep

4 uses

	runtime (current package)
		mgcsweep.go#L277: 	goparkunlock(&sweep.lock, waitReasonGCSweepWait, traceBlockGCSweep, 1)
		mgcsweep.go#L317: 		goparkunlock(&sweep.lock, waitReasonGCSweepWait, traceBlockGCSweep, 1)
		traceruntime.go#L96: 	traceBlockGCSweep
		traceruntime.go#L115: 	traceBlockGCSweep:            "GC background sweeper wait",