Add helper method

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@4744 91177308-0d34-0410-b5e6-96231b3b80d8

include/llvm/CodeGen/MachineInstr.h

@@ -190,6 +190,10 @@ public:
     return regNum;
   }
 
+  inline unsigned getReg() const {
+    assert(hasAllocatedReg() && "Cannot call MachineOperand::getReg()!");
+    return regNum;
+  }    
   
   friend std::ostream& operator<<(std::ostream& os, const MachineOperand& mop);