Subzero: Improve class definition hygiene.

src/IceUtils.h

 //===- subzero/src/IceUtils.h - Utility functions ---------------*- C++ -*-===//
 //
 //                        The Subzero Code Generator
 //
 // This file is distributed under the University of Illinois Open Source
 // License. See LICENSE.TXT for details.
 //
 //===----------------------------------------------------------------------===//
 //
 // This file declares some utility functions.
@@ skipping 13 matching lines @@
 // virtually useless.
 template <class D, class S> inline D bit_copy(const S &source) {
   D destination;
   // This use of memcpy is safe: source and destination cannot overlap.
   memcpy(&destination, reinterpret_cast<const void *>(&source),
          sizeof(destination));
   return destination;
 }
 
 class Utils {
+  Utils() = delete;
+  Utils(const Utils &) = delete;
+  Utils &operator=(const Utils &) = delete;
+
 public:
   // Check whether an N-bit two's-complement representation can hold value.
   template <typename T> static inline bool IsInt(int N, T value) {
     assert((0 < N) &&
            (static_cast<unsigned int>(N) < (CHAR_BIT * sizeof(value))));
     T limit = static_cast<T>(1) << (N - 1);
     return (-limit <= value) && (value < limit);
   }
 
   template <typename T> static inline bool IsUint(int N, T value) {
@@ skipping 13 matching lines @@
     uint64_t Mod = Pos & (Align - 1);
     if (Mod == 0)
       return 0;
     return Align - Mod;
   }
 };
 
 } // end of namespace Ice
 
 #endif // SUBZERO_SRC_ICEUTILS_H