[PATCH] Disallow in-source builds

[Philip Reames]

I withdraw all objection.

On 06/22/2015 04:30 PM, Jonathan Roelofs wrote:
> @reames: you mean @kledzik? @nlewycky already gave a thumbs up in the aforementioned thread: http://lists.cs.uiuc.edu/pipermail/llvm-commits/Week-of-Mon-20150323/268067.html
>
> Anyone else?
>
>
> http://reviews.llvm.org/D10614
>
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