Peter Zhu 7b77d46671 Decouple GC slot sizes from RVALUE
Add a new macro BASE_SLOT_SIZE that determines the slot size.

For Variable Width Allocation (compiled with USE_RVARGC=1), all slot
sizes are powers-of-2 multiples of BASE_SLOT_SIZE.

For USE_RVARGC=0, BASE_SLOT_SIZE is set to sizeof(RVALUE).
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