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Document MIN_PAYLOAD_SIZE and mark-compact GC mark bits

Ömer Sinan Ağacan requested to merge osa1/ghc:document_min_payload_size into master

This updates the documentation of the MIN_PAYLOAD_SIZE constant and adds a new Note [Mark bits in mark-compact collector] explaning why the mark-compact collector uses two bits per objet and why we need MIN_PAYLOAD_SIZE.

@simonmar @bgamari please review.

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