const runtime.waitReasonGarbageCollection

4 uses

	runtime (current package)
		mgc.go#L1022: 	casGToWaitingForGC(curgp, _Grunning, waitReasonGarbageCollection)
		runtime2.go#L1068: 	waitReasonGarbageCollection                       // "garbage collection"
		runtime2.go#L1109: 	waitReasonGarbageCollection:     "garbage collection",
		runtime2.go#L1169: 	waitReasonGarbageCollection:     true,