var runtime.useCheckmark

7 uses

	runtime (current package)
		mcheckmark.go#L33: var useCheckmark = false
		mcheckmark.go#L66: 	useCheckmark = true
		mcheckmark.go#L74: 	useCheckmark = false
		mgcmark.go#L387: 			if !useCheckmark && !(s.sweepgen == sg || s.sweepgen == sg+3) {
		mgcmark.go#L1667: 	if useCheckmark {
		mgcmark.go#L1770: 	if useCheckmark { // The world should be stopped so this should not happen.
		mwbbuf.go#L205: 	if useCheckmark {