Index: llvm/trunk/include/llvm/DebugInfo/DWARF/DWARFDie.h
===================================================================
--- llvm/trunk/include/llvm/DebugInfo/DWARF/DWARFDie.h
+++ llvm/trunk/include/llvm/DebugInfo/DWARF/DWARFDie.h
@@ -404,6 +404,10 @@
       Die = Die.getPreviousSibling();
   }
 
+  llvm::DWARFDie::iterator base() const {
+    return llvm::DWARFDie::iterator(AtEnd ? Die : Die.getSibling());
+  }
+
   reverse_iterator<llvm::DWARFDie::iterator> &operator++() {
     assert(!AtEnd && "Incrementing rend");
     llvm::DWARFDie D = Die.getPreviousSibling();
Index: llvm/trunk/unittests/DebugInfo/DWARF/DWARFDebugInfoTest.cpp
===================================================================
--- llvm/trunk/unittests/DebugInfo/DWARF/DWARFDebugInfoTest.cpp
+++ llvm/trunk/unittests/DebugInfo/DWARF/DWARFDebugInfoTest.cpp
@@ -1227,6 +1227,10 @@
   EXPECT_THAT(std::vector<DWARFDie>(A.rbegin(), A.rend()),
               testing::ElementsAre(D, C, B));
 
+  // Make sure conversion from reverse iterator works as expected.
+  EXPECT_EQ(A.rbegin().base(), A.end());
+  EXPECT_EQ(A.rend().base(), A.begin());
+
   // Make sure iterator is bidirectional.
   {
     auto Begin = A.begin();