Fix issue with invalid flat operand number

Avoid iterating over list of operands beyond the number of operands in it.

PS: this fixes issue with revision #167634.
llvm-svn: 167635

llvm/utils/TableGen/CodeEmitterGen.cpp

@@ -140,9 +140,7 @@ AddCodeToMergeInOperand(Record *R, BitsInit *BI, const std::string &VarName,
     while (NumberedOp < NumberOps &&
            CGI.Operands.isFlatOperandNotEmitted(NumberedOp))
       ++NumberedOp;
-    // If this operand has not been found, ignore it.
-    if (NumberedOp >= NumberOps)
-      return;
+
     OpIdx = NumberedOp++;
   }