const runtime.waitReasonWaitForGCCycle

3 uses

	runtime (current package)
		mgc.go#L663: 		goparkunlock(&work.sweepWaiters.lock, waitReasonWaitForGCCycle, traceBlockUntilGCEnds, 1)
		runtime2.go#L1251: 	waitReasonWaitForGCCycle                          // "wait for GC cycle"
		runtime2.go#L1301: 	waitReasonWaitForGCCycle:        "wait for GC cycle",