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r270777 improved the precision of alloca vs. inbounbds GEP alias queries: if we have (a) an inbounds GEP and (b) a pointer based on an alloca, and the beginning of the object the GEP points to would have a negative offset with respect to the alloca, then the GEP can not alias pointer (b). This makes the same logic fire when (b) is based on a GlobalVariable instead of an alloca. Differential Revision: http://reviews.llvm.org/D20652 llvm-svn: 270893
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