[PATCH] [Driver] Convert response files with UTF-16 BOMs to UTF-8

[Reid Kleckner]

On Mon, Jul 15, 2013 at 8:37 AM, Reid Kleckner <rnk at google.com> wrote:

> > Is it possible for the buffer to only contain a single byte?
>
> MemoryBuffer makes sure the file is null terminated, but the empty file is
> still a corner case where we have a single byte buffer over read.  I should
> fix it.
>
> This is growing enough corner cases that I'm reconsidering my decision to
> not put this in llvm/lib/Support/ConvertUTF8Wrappers.cc.  I didn't like the
> idea of loading an entire response file (usually large) into a std::string,
> but the reality is that we're building a set of strings anyway.
>

Considering that lld will need response file support, I should do this
differently.
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