const runtime.waitReasonGarbageCollection

3 uses

	runtime (current package)
		mgc.go#L954: 	casGToWaiting(curgp, _Grunning, waitReasonGarbageCollection)
		runtime2.go#L1064: 	waitReasonGarbageCollection                       // "garbage collection"
		runtime2.go#L1099: 	waitReasonGarbageCollection:     "garbage collection",