Index: include/llvm/IR/Dominators.h
===================================================================
--- include/llvm/IR/Dominators.h
+++ include/llvm/IR/Dominators.h
@@ -157,6 +157,10 @@
   /// This should only be used for debugging as it aborts the program if the
   /// verification fails.
   void verifyDomTree() const;
+
+  // Pop up a GraphViz/gv window with the Dominator Tree rendered using `dot`.
+  void viewGraph(const Twine &Name, const Twine &Title);
+  void viewGraph();
 };
 
 //===-------------------------------------
Index: lib/Analysis/DomPrinter.cpp
===================================================================
--- lib/Analysis/DomPrinter.cpp
+++ lib/Analysis/DomPrinter.cpp
@@ -80,6 +80,22 @@
 };
 }
 
+void DominatorTree::viewGraph(const Twine &Name, const Twine &Title) {
+#ifndef NDEBUG
+  ViewGraph(this, Name, false, Title);
+#else
+  errs() << "build with NDEBUG\n";
+#endif  // NDEBUG
+}
+
+void DominatorTree::viewGraph() {
+#ifndef NDEBUG
+  this->viewGraph("my dom", "dom");
+#else
+  errs() << "build with NDEBUG\n";
+#endif  // NDEBUG
+}
+
 namespace {
 struct DominatorTreeWrapperPassAnalysisGraphTraits {
   static DominatorTree *getGraph(DominatorTreeWrapperPass *DTWP) {