diff --git a/lib/CodeGen/MachineInstr.cpp b/lib/CodeGen/MachineInstr.cpp
index 358ea3f..f9c20e6 100644
--- a/lib/CodeGen/MachineInstr.cpp
+++ b/lib/CodeGen/MachineInstr.cpp
@@ -1314,3 +1314,12 @@
                                        true  /*IsDead*/));
   return true;
 }
+
+void MachineInstr::addRegisterDefined(unsigned IncomingReg,
+                                      const TargetRegisterInfo *RegInfo) {
+  MachineOperand *MO = findRegisterDefOperand(IncomingReg, false, RegInfo);
+  if (!MO || MO->getSubReg())
+    addOperand(MachineOperand::CreateReg(IncomingReg,
+                                         true  /*IsDef*/,
+                                         true  /*IsImp*/));
+}