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ed0b9ad2e6
support notionally const queries even though they may trigger DFS numbering updates. The updating of DFS numbers and tracking of slow queries do not mutate the observable state of the domtree. They should be const to differentiate them from the APIs which mutate the tree directly to do incremental updates. This will make it possible in a world where the DominatorTree is not a pass but merely the result of running a pass to derive DominatorTree from the base class as it was originally designed, removing a huge duplication of API in DominatorTree. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@199101 91177308-0d34-0410-b5e6-96231b3b80d8
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