Subzero: Improve class definition hygiene.

src/IceAPInt.h

 //===-- subzero/src/IceAPInt.h - Constant integer conversions --*- C++ -*--===//
 //
 //                     The LLVM Compiler Infrastructure
 //
 // This file is distributed under the University of Illinois Open Source
 // License. See LICENSE.TXT for details.
 //
 //===----------------------------------------------------------------------===//
 ///
 /// \file
 /// \brief This file implements a class to represent 64 bit integer constant
-/// values, and thier conversion to variable bit sized integers.
+/// values, and their conversion to variable bit sized integers.
 ///
 /// Note: This is a simplified version of llvm/include/llvm/ADT/APInt.h for use
 /// with Subzero.
 //===----------------------------------------------------------------------===//
 
 #ifndef SUBZERO_SRC_ICEAPINT_H
 #define SUBZERO_SRC_ICEAPINT_H
 
 #include "IceDefs.h"
 
 namespace Ice {
 
 class APInt {
+  APInt() = delete;
+  APInt(const APInt &) = delete;
+  APInt &operator=(const APInt &) = delete;
+
 public:
   /// Bits in an (internal) value.
   static const SizeT APINT_BITS_PER_WORD = sizeof(uint64_t) * CHAR_BIT;
 
   APInt(SizeT Bits, uint64_t Val) : BitWidth(Bits), Val(Val) {
     assert(Bits && "bitwidth too small");
     assert(Bits <= APINT_BITS_PER_WORD && "bitwidth too big");
     clearUnusedBits();
   }
 
@@ skipping 17 matching lines @@
       return;
 
     // Mask out the high bits.
     Val &= ~static_cast<uint64_t>(0) >> (APINT_BITS_PER_WORD - BitWidth);
   }
 };
 
 } // end of namespace Ice
 
 #endif // SUBZERO_SRC_ICEAPINT_H