const runtime.waitReasonWaitForGCCycle

3 uses

	runtime (current package)
		mgc.go#L526: 		goparkunlock(&work.sweepWaiters.lock, waitReasonWaitForGCCycle, traceBlockUntilGCEnds, 1)
		runtime2.go#L1083: 	waitReasonWaitForGCCycle                          // "wait for GC cycle"
		runtime2.go#L1118: 	waitReasonWaitForGCCycle:        "wait for GC cycle",