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When working with tokens, it is often the case that one has instructions which consume a token and produce a new token. Currently, we have no mechanism to represent an initial token state. Instead, we can create a notional "empty token" by inventing a new constant which captures the semantics we would like. This new constant is called ConstantTokenNone and is written textually as "token none". Differential Revision: http://reviews.llvm.org/D14581 git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@252811 91177308-0d34-0410-b5e6-96231b3b80d8