const runtime.scavChunkHasFree

4 uses

	runtime (current package)
		mgcscavenge.go#L1287: 	scavChunkHasFree scavChunkFlags = 1 << iota
		mgcscavenge.go#L1314: 	return (*sc)&scavChunkHasFree == 0
		mgcscavenge.go#L1319: 	*sc &^= scavChunkHasFree
		mgcscavenge.go#L1324: 	*sc |= scavChunkHasFree