[PATCH] Teach llvm::format_hex() to support formatting without a prefix '0x'

[Chandler Carruth]

Yea, formatting should just support this...

On Fri, Jan 23, 2015 at 1:18 PM, Zachary Turner <zturner at google.com> wrote:

> In http://reviews.llvm.org/D7151#112909, @majnemer wrote:
>
> > Why not just use `llvm::utohexstr`?
>
>
> Isn't that less efficient than just writing directly to the stream?
> Results in one heap allocation for every byte.
>
>
> http://reviews.llvm.org/D7151
>
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