revlog: made C Capsule an array of function pointers
Although it's perfectly valid to put a function pointer in a capsule, as we've been doing since the start of rust/hg-cpython, an array of function pointers has several advantages: - it can hold several functions. That's our main motivation here. We plan to expose index_length() and index_node(), which will be needed for a Rust implementation of nodemap. - it could also have data - (probably minor in the case of Mercurial) proper support for architectures for which data and code pointers don't have the same size. Differential Revision: https://phab.mercurial-scm.org/D7543
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