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on the algorithm for directly computing immediate dominators presented in this paper: A Fast Algorithm for Finding Dominators in a Flowgraph T. Lengauer & R. Tarjan, ACM TOPLAS July 1979, pgs 121-141. This _substantially_ speeds up construction of all dominator related information. Post-dominators to follow. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@10301 91177308-0d34-0410-b5e6-96231b3b80d8