[PATCH 2 of 4] revset: define _symletters in terms of _syminitletters

[Yuya Nishihara]

On Fri, 07 Oct 2016 08:50:46 -0400, Augie Fackler wrote:
> # HG changeset patch
> # User Augie Fackler <augie at google.com>
> # Date 1475842163 14400
> #      Fri Oct 07 08:09:23 2016 -0400
> # Node ID d7777ef3fe7f82524c2925d9af6c3e1884a4188d
> # Parent  da814a1e51a7c97d0b4a1a7519bdca87802e4e6d
> revset: define _symletters in terms of _syminitletters

Queued the first 2 patches, thanks.