const runtime.waitReasonWaitForGCCycle

3 uses

	runtime (current package)
		mgc.go#L502: 		goparkunlock(&work.sweepWaiters.lock, waitReasonWaitForGCCycle, traceEvGoBlock, 1)
		runtime2.go#L1038: 	waitReasonWaitForGCCycle                          // "wait for GC cycle"
		runtime2.go#L1068: 	waitReasonWaitForGCCycle:        "wait for GC cycle",