Convert aggregate loads/stroes into scalar load/stores

[Philip Reames]

Can you throw this on phabricator to simplify review?  I see a couple of 
nits.

Thanks for pursuing this.  I really want to see this land.

Philip

On 02/11/2015 10:44 AM, deadal nix wrote:
> As per title.
>
> For reference: 
> http://lists.cs.uiuc.edu/pipermail/llvm-commits/Week-of-Mon-20140929/238371.html
>
> Last time, the discussion lead to the conclusion that the best way to 
> do it was to convert these into stores/loads of scalar representing 
> the whole struct or array. I finally had some time to get back to 
> this, and here is the result.
>
> It comes with testing and all, and seems fairly low risk to me, as 
> support for aggregate load/store is almost non existent at this point.
>
>
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