[PATCH] Disallow in-source builds

[Jonathan Roelofs]

@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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