Add 'remark' diagnostic type in clang

[Chandler Carruth]

On Fri, Feb 28, 2014 at 11:43 AM, Arthur O'Dwyer
<arthur.j.odwyer at gmail.com>wrote:

> FWIW, I'm strongly strongly opposed to making up a second
> parallel-universe diagnostic system (-W versus -R, -Werror= versus
> <nothing>, etc.) that will have to be maintained in perpetuity alongside
> the old system, when it's trivially possible to extend the old system to
> support varying severity levels.


Note, my suggestion was to teach the *existing* system to give the
semantics we want to flags with these spellings. We don't need two pieces
of infrastructure to support different spellings.
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