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

[Zachary Turner]

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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