[Dominators] Remove DominatorBase class
Summary:
DominatorBase class was only used by DominatorTreeBase. It didn't provide any useful abstractions, nor simplified anything, so I see no point keeping it.
This commit removes the DominatorBase class and moves its content into DominatorTreeBase.
This is the first patch in a series that tries to make all DomTrees have a single virtual root, which will allow to further simplify code (especially when it comes to incremental updates).
Reviewers: dberlin, sanjoy, chandlerc
Reviewed By: dberlin
Subscribers: llvm-commits
Differential Revision: https://reviews.llvm.org/D34493
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@306713
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