Adapt operator= and operator^= of Smi to be similar to other internal VM classes.

vm/object.h

 // Copyright (c) 2012, the Dart project authors.  Please see the AUTHORS file
 // for details. All rights reserved. Use of this source code is governed by a
 // BSD-style license that can be found in the LICENSE file.
 
 #ifndef VM_OBJECT_H_
 #define VM_OBJECT_H_
 
 #include "include/dart_api.h"
 #include "platform/assert.h"
 #include "platform/utils.h"
@@ skipping 3702 matching lines @@
   static bool IsValid(intptr_t value) {
     return (value >= kMinValue) && (value <= kMaxValue);
   }
 
   static bool IsValid64(int64_t value) {
     return (value >= kMinValue) && (value <= kMaxValue);
   }
 
   RawInteger* ShiftOp(Token::Kind kind, const Smi& other) const;
 
+  void operator=(RawSmi* value) {
+    raw_ = value;
+    CHECK_HANDLE();
+  }
+  void operator^=(RawObject* value) {
+    raw_ = value;
+    CHECK_HANDLE();
+  }
+
  private:
   static intptr_t ValueFromRaw(uword raw_value) {
     intptr_t value = raw_value;
     ASSERT((value & kSmiTagMask) == kSmiTag);
     return (value >> kSmiTagShift);
   }
   static cpp_vtable handle_vtable_;
 
-  OBJECT_IMPLEMENTATION(Smi, Integer);
+  Smi() : Integer() {}
+  BASE_OBJECT_IMPLEMENTATION(Smi, Integer);
+
   friend class Api;  // For ValueFromRaw
   friend class Class;
   friend class Object;
 };
 
 
 class Mint : public Integer {
  public:
   static const intptr_t kBits = 63;  // 64-th bit is sign.
   static const int64_t kMaxValue =
@@ skipping 2568 matching lines @@
 
 
 RawObject* MegamorphicCache::GetTargetFunction(const Array& array,
                                                intptr_t index) {
   return array.At((index * kEntryLength) + kTargetFunctionIndex);
 }
 
 }  // namespace dart
 
 #endif  // VM_OBJECT_H_