optimization for code that reuses variables - one-ref-same-type variable sets now avoid allocations by modifying dest.var.
optimization for code that reuses variables
- one-ref-same-type variable sets now avoid allocations by modifying dest.var.

snake5/sgscript,snake5/sgscript,snake5/sgscript,elvman/sgscript,elvman/sgscript,snake5/sgscript