a18dcf7 [dom] Make the DominatorTreeBase not a dynamic class!

Authored and Committed by Chandler Carruth 9 years ago
    [dom] Make the DominatorTreeBase not a dynamic class!
    
    Now that the passes are wrappers around this, we no longer need
    a vtable, virtual destructor, and other associated mess. This is
    particularly nice to me as this is a class template. =]
    
    llvm-svn: 225970