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79e2045531
Don't compute the SuperRegs list until the sub-register graph is completely finished. This guarantees that the list of super-registers is properly topologically ordered, and has no duplicates. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@156629 91177308-0d34-0410-b5e6-96231b3b80d8
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