var runtime.useCheckmark

7 uses

	runtime (current package)
		mcheckmark.go#L31: var useCheckmark = false
		mcheckmark.go#L59: 	useCheckmark = true
		mcheckmark.go#L67: 	useCheckmark = false
		mgcmark.go#L351: 			if !useCheckmark && !(s.sweepgen == sg || s.sweepgen == sg+3) {
		mgcmark.go#L1415: 	if useCheckmark {
		mgcmark.go#L1515: 	if useCheckmark { // The world should be stopped so this should not happen.
		mwbbuf.go#L225: 	if useCheckmark {

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