Adding a cache for dirstate

[Raphaël Gomès]

Bikeshedding update:

How about naming it "DirsTraversalCache" instead? "DirsCache" was a bit 
of a placeholder and not clear enough for my taste (and others as well 
I've been told). It would go in `.hg/wcache/dirs_traversal_cache`.

On 5/14/20 7:47 PM, Raphaël Gomès wrote:
> Hi all,
>
> I have made a new plan page explaining a new cache for 
> `dirstate.status` in detail:
>
> https://www.mercurial-scm.org/wiki/DirsCachePlan
>
> Maybe this email can be the discussion thread around this. I'm not 
> sure how other plans have worked in this regard.
>
> Thanks,
> Raphaël
>
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