[PATCH 5 of 8 sparse V2] dirstate: expose a sparse matcher on dirstate (API)

[Martin von Zweigbergk]

On Mon, Jul 10, 2017 at 9:57 PM, Gregory Szorc <gregory.szorc at gmail.com> wrote:
> # HG changeset patch
> # User Gregory Szorc <gregory.szorc at gmail.com>
> # Date 1499555884 25200
> #      Sat Jul 08 16:18:04 2017 -0700
> # Node ID 03eed39f7af2db1678c2d39a2a7342e5c66b0804
> # Parent  ee818b5e70b42f4bd65605c5872d06e5bc0a0bb5
> dirstate: expose a sparse matcher on dirstate (API)

I've queued up to here for now, thanks!

I don't mind queuing the _ensuresparsematch() patch too. I think
raising an exception there is probably the right thing. Want to do
that in a followup or resend (if you agree, of course)?