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1. If memory never escapes the program, it cannot be mod/ref'd by external functions. 2. If memory is global never mod/ref'd in the program, it cannot be mod/ref'd by any call. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@20867 91177308-0d34-0410-b5e6-96231b3b80d8