midx: stop deduplicating info redundant with their sources

Hi,

this patch series is a follow up to the recent patch series that started to move the MIDX into its object source. It refactors the MIDX subsystem so that we always read and write them via an ODB source. This ultimately allows us to store a pointer to the owning ODB source in the MIDX and thus dedup some redundant information.

Thanks!

Patrick

To: git@vger.kernel.org Cc: Taylor Blau me@ttaylorr.com

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