diff --git a/lib/CodeGen/IfConversion.cpp b/lib/CodeGen/IfConversion.cpp
index 8d212a6..b9ee23a 100644
--- a/lib/CodeGen/IfConversion.cpp
+++ b/lib/CodeGen/IfConversion.cpp
@@ -1174,8 +1174,7 @@
     // Fallthrough edge can't be transferred.
     if (Succ == FallThrough)
       continue;
-    if (!ToBBI.BB->isSuccessor(Succ))
-      ToBBI.BB->addSuccessor(Succ);
+    ToBBI.BB->addSuccessor(Succ);
   }
 
   std::copy(FromBBI.Predicate.begin(), FromBBI.Predicate.end(),
@@ -1215,12 +1214,11 @@
     if (Succ == FallThrough)
       continue;
     FromBBI.BB->removeSuccessor(Succ);
-    if (!ToBBI.BB->isSuccessor(Succ))
-      ToBBI.BB->addSuccessor(Succ);
+    ToBBI.BB->addSuccessor(Succ);
   }
 
   // Now FromBBI always fall through to the next block!
-  if (NBB && !FromBBI.BB->isSuccessor(NBB))
+  if (NBB)
     FromBBI.BB->addSuccessor(NBB);
 
   std::copy(FromBBI.Predicate.begin(), FromBBI.Predicate.end(),
diff --git a/lib/CodeGen/MachineBasicBlock.cpp b/lib/CodeGen/MachineBasicBlock.cpp
index 5ac54ea8..71e6b3e 100644
--- a/lib/CodeGen/MachineBasicBlock.cpp
+++ b/lib/CodeGen/MachineBasicBlock.cpp
@@ -305,11 +305,9 @@
         I->getOperand(i).setMBB(New);
   }
 
-  // Update the successor information.  If New was already a successor, just
-  // remove the link to Old instead of creating another one.  PR 1444.
+  // Update the successor information.
   removeSuccessor(Old);
-  if (!isSuccessor(New))
-    addSuccessor(New);
+  addSuccessor(New);
 }
 
 /// CorrectExtraCFGEdges - Various pieces of code can cause excess edges in the