Merge from mainline.

    : Value(Ty, vty), OperandList(OpList), NumOperands(NumOps) {}

public:

  /// placement delete - required by std, but never called.

  void operator delete(void*, size_t) {

    assert(0 && "Constructor throws?");

  }

  Value *getOperand(unsigned i) const {

    assert(i < NumOperands && "getOperand() out of range!");

    return OperandList[i];