const runtime.waitReasonGarbageCollectionScan

4 uses

	runtime (current package)
		mgcmark.go#L222: 				casGToWaitingForSuspendG(userG, _Grunning, waitReasonGarbageCollectionScan)
		runtime2.go#L1051: 	waitReasonGarbageCollectionScan                   // "garbage collection scan"
		runtime2.go#L1098: 	waitReasonGarbageCollectionScan: "garbage collection scan",
		runtime2.go#L1164: 	waitReasonGarbageCollectionScan: true,