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The LiveDebugValues and LiveDebugVariables implementations for handling DBG_VALUE_LIST instructions can be simplified significantly if they do not have to deal with any duplicated operands, such as a DBG_VALUE_LIST that uses the same register multiple times in its expression. This patch adds a function, replaceArg, that can be used to simplify a DIExpression in the case of duplicated operands. Differential Revision: https://reviews.llvm.org/D83896
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