const runtime.gcTriggerCycle

4 uses

	runtime (current package)
		mgc.go#L442: 	gcStart(gcTrigger{kind: gcTriggerCycle, n: n + 1})
		mgc.go#L539: 	gcTriggerCycle
		mgc.go#L562: 	case gcTriggerCycle:
		mgc.go#L612: 	work.userForced = trigger.kind == gcTriggerCycle