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swifterror marks an argument as a register pretending to be a pointer, so we need a guaranteed mem2reg-like analysis of its uses. Fortunately most of the infrastructure can be reused from the DAG world. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@361608 91177308-0d34-0410-b5e6-96231b3b80d8