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Based on review comments from Richard Smith, restrict this optimization from applying to globals that might resolve lazily to other dynamically-loaded modules, and also from dynamic allocas (which might be transformed into malloc calls). In short, take extra care that the compared-to pointer is really simultaneously live with the memory allocation. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@223347 91177308-0d34-0410-b5e6-96231b3b80d8