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This is fixing pr31761: BasicAA is deducing NoAlias on the result of the GEP if the base pointer is itself NoAlias. This is possible only if the NoAlias on the base pointer is deduced with a non-sized query: this should guarantee that the pointers are belonging to different memory allocation and that the GEP can't legally jump from one to another. Differential Revision: https://reviews.llvm.org/D29216 llvm-svn: 293293
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