[PATCH 1 of 2] match: optimize visitdir() for patterns matching only root directory

[Yuya Nishihara]

On Fri, 05 May 2017 09:39:48 -0700, Martin von Zweigbergk via Mercurial-devel wrote:
> # HG changeset patch
> # User Martin von Zweigbergk <martinvonz at google.com>
> # Date 1493999347 25200
> #      Fri May 05 08:49:07 2017 -0700
> # Node ID d89bf290dc63661e5e1cdc48753322c30560c15d
> # Parent  2cfdf5241096f6c0c2d45d32b2f1a41575835025
> match: optimize visitdir() for patterns matching only root directory

Looks good. Queued, thanks.