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MachinePointerInfo when getStore is called to create a node that stores an argument passed in register to the stack. Without this change, the post RA scheduler will fail to discover the dependencies between the stores instructions and the instructions that load from a structure passed by value. The link to the related discussion is here: http://lists.cs.uiuc.edu/pipermail/llvmdev/2012-March/048055.html git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@153499 91177308-0d34-0410-b5e6-96231b3b80d8