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Make sure CodeGenPrepare doesn't emit multiple inttoptr instructions of the same integer value while sinking address computations, but rather CSEs them on the fly: excessive inttoptr's confuse SCEV into thinking that related pointers have nothing to do with each other. This problem blocks LoadStoreVectorizer from vectorizing some of the loads / stores in a downstream target. Reviewed By: hfinkel Differential Revision: https://reviews.llvm.org/D56838 llvm-svn: 351582
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