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rts: drop stale mentions of MIN_UPD_SIZE

Cheng Shao requested to merge type-dance/ghc:rts-drop-min-upd-size into master

We used to have MIN_UPD_SIZE macro that describes the minimum reserved size for thunks, so that the thunk can be overwritten in place as indirections or blackholes. However, this macro has not been actually defined or used anywhere since a long time ago; StgThunkHeader already reserves a padding word for this purpose. Hence this patch which drops stale mentions of MIN_UPD_SIZE.

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