squeak: GC cleanup
squeak: GC cleanup

NikolaySuslov/LivelyKernel,NikolaySuslov/LivelyKernel,pascience/LivelyKernel,LivelyKernel/LivelyKernel,NikolaySuslov/LivelyKernel,pascience/LivelyKernel,pascience/LivelyKernel,LivelyKernel/LivelyKernel,LivelyKernel/LivelyKernel