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

[Chandler Carruth]

On Fri, Jan 23, 2015 at 1:58 PM, Rui Ueyama <ruiu at google.com> wrote:

> 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.


I would be fine to change all users to just write '0x' into the stream
first.
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