[PATCH] Document HLE metadata

[Michael Liao]

Hi Sean

Thanks for your reminder. I will a rationale paragraph. Hope it could
answer some fundamental questions.

Yours
- Michael

On Wed, 2013-02-27 at 14:36 -0800, Sean Silva wrote:
> It would be nice to include a rationale for this, so that future readers can understand why this was put in. Grep for `.. admonition:: Rationale` to see other places (all quite recent) where rationale is added.
> 
> http://llvm-reviews.chandlerc.com/D475
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