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multiple times. This reduces the time to construct post-dominance sets a LOT. For example, optimizing perlbmk goes from taking 12.9894s to 1.4074s. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@9091 91177308-0d34-0410-b5e6-96231b3b80d8