Introduce StringBuilder utility around raw_string_ostream

[Chandler Carruth]

On Thu, Jun 26, 2014 at 2:09 AM, Alp Toker <alp at nuanti.com> wrote:

> I've made that change, plus a couple more updated uses, and landed this in
> r211749.
>

I don't understand why.

I think my objection to the design direction stands, but I'm tired of
arguing pointlessly so I'm not going to restate things.
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