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

[Rui Ueyama]

Why does format_hex prints out "0x" prefix in the first place? If it
doesn't, like printf %x, we don't need an extra parameter or a separate
function. It may be too late, though.

On Fri, Jan 23, 2015 at 1:46 PM, Chandler Carruth <chandlerc at google.com>
wrote:

> 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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