Introduce StringBuilder utility around raw_string_ostream

[Chandler Carruth]

On Fri, Jun 27, 2014 at 1:55 AM, David Blaikie <dblaikie at gmail.com> wrote:

> Realized of course that since raw_string_ostream::str returns a
> std::string&
>

FWIW, I don't see any fundamental problem switching this to return a
StringRef -- callers probably should be accepting it even if they aren't
already.
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