Fix fixme: remove unused method.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@203552 91177308-0d34-0410-b5e6-96231b3b80d8

include/llvm/IR/Dominators.h

@@ -69,10 +69,6 @@ public:
 
   DominatorTree() : DominatorTreeBase<BasicBlock>(false) {}
 
-  // FIXME: This is no longer needed and should be removed when its uses are
-  // cleaned up.
-  Base& getBase() { return *this; }
-
   /// \brief Returns *false* if the other dominator tree matches this dominator
   /// tree.
   inline bool compare(const DominatorTree &Other) const {