const runtime.waitReasonForceGCIdle

3 uses

	runtime (current package)
		proc.go#L375: 		goparkunlock(&forcegc.lock, waitReasonForceGCIdle, traceBlockSystemGoroutine, 1)
		runtime2.go#L1234: 	waitReasonForceGCIdle                             // "force gc (idle)"
		runtime2.go#L1290: 	waitReasonForceGCIdle:           "force gc (idle)",