var runtime.freemark

5 uses

	runtime (current package)
		heapdump.go#L475: var freemark [pageSize / 8]bool
		heapdump.go#L488: 		if n > uintptr(len(freemark)) {
		heapdump.go#L494: 				freemark[freeIndex] = true
		heapdump.go#L499: 			if freemark[j] {
		heapdump.go#L500: 				freemark[j] = false