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Planning to add support for named vregs. This puts is in a conundrum since physregs are named as well. To rectify this we need to use a sigil other than '%' for physregs in MIR. We've settled on using '$' for physregs but first we must repurpose it from external symbols using it, which is what this commit is all about. We think '&' will have familiar semantics for C/C++ users. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@322146 91177308-0d34-0410-b5e6-96231b3b80d8