const runtime.waitReasonGarbageCollectionScan

3 uses

	runtime (current package)
		mgcmark.go#L222: 				casGToWaiting(userG, _Grunning, waitReasonGarbageCollectionScan)
		runtime2.go#L1065: 	waitReasonGarbageCollectionScan                   // "garbage collection scan"
		runtime2.go#L1100: 	waitReasonGarbageCollectionScan: "garbage collection scan",