[PATCH] Emit lifetime start/end for unnamed objects --- take 3

[Reid Kleckner]

On Thu, Sep 25, 2014 at 2:20 AM, Chandler Carruth <chandlerc at google.com>
wrote:

> Hey Reid, you're neck deep in cleanups and EH stuff, could you take a look
> at this?
>
> It seems really important to have several folks familiar with this as its
> been tricky to land w/o regressing things but lays the groundwork for
> *really* important stack usage reductions, something we're all really
> sensitive to...
>

I already stamped the version that got reverted, so I'm not sure I really
understand all the lifetime issues, especially around lifetime extended
temporaries. I can take another look though.
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