RFC: add "cmpxchg weak" to LLVM IR

[Chandler Carruth]

On Thu, Jun 12, 2014 at 5:22 PM, Tim Northover <t.p.northover at gmail.com>
wrote:

> 1. All cmpxchg instructions now return { iN, i1 } where the first
> value is what we got before (the loaded result), the second == 1 if an
> exchange took place.
>

Having to do extractvalue to get stuff out of these kinds of aggregates
is... somewhat horrible... have you thought of any alternatives?
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