const runtime.waitReasonGarbageCollectionScan

4 uses

	runtime (current package)
		mgcmark.go#L288: 				casGToWaitingForSuspendG(userG, _Grunning, waitReasonGarbageCollectionScan)
		runtime2.go#L1229: 	waitReasonGarbageCollectionScan                   // "garbage collection scan"
		runtime2.go#L1281: 	waitReasonGarbageCollectionScan: "garbage collection scan",
		runtime2.go#L1372: 	waitReasonGarbageCollectionScan: true,