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revlog: replace revlog._io.size with a new revlog.index.entry_size

Authored by marmoute.

Description

revlog: replace revlog._io.size with a new revlog.index.entry_size

The revlogio class is mostly a relic from the past. Once in charge of the full
revlog related Input/Output code, that class gradually lost responsibilities to
the point where more IO are now done by revlog.index objects or revlog objects
themself. I would like to ultimately remove the revlogio class, to do so I
start simple with move the "entry size" information on the index. (The index is
already responsible of the binary unpacking, so it knows the size.

Differential Revision: https://phab.mercurial-scm.org/D10309

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