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7eaa93aa2b
This requirement was a huge hack to keep LiveVariables alive because it was optionally used by TwoAddressInstructionPass and PHIElimination. However we have AnalysisUsage::addUsedIfAvailable() which we can use in those passes. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@260806 91177308-0d34-0410-b5e6-96231b3b80d8