Introduce StringBuilder utility around raw_string_ostream

[Chandler Carruth]

Just as a very small correction to some of the facts here:

On Mon, Jun 30, 2014 at 2:24 PM, Alp Toker <alp at nuanti.com> wrote:

> 1) Uses a non-heap container (SmallString) by default.


std::string has a small-string optimization in both libc++ and, whenever
GCC takes the ABI break and conforms with C++11, libstdc++

So you don't have to use SmallString to avoid heap allocations. The primary
advantage of SmallString is the ability to customize how many bytes are
available in the internal buffer.
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