[patch/rfc][pr17902] GC unused parts of mergeable sections

[Rafael Espíndola]

> While working on it I noticed how remarkably similar the code is to
> the existing merge map. I now think the merge map can be reused for
> this.

A version using the existing merge_map. It still needs cleanups and
tests, but it is probably better to do that after the other patches
are in.

Cheers,
Rafael
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