const runtime.waitReasonGarbageCollectionScan

3 uses

	runtime (current package)
		mgcmark.go#L223: 				userG.waitreason = waitReasonGarbageCollectionScan
		runtime2.go#L1022: 	waitReasonGarbageCollectionScan                   // "garbage collection scan"
		runtime2.go#L1052: 	waitReasonGarbageCollectionScan: "garbage collection scan",