Implement unaligned allocate and allocate heap numbers in runtime double unaligned.

src/objects.h

 // Copyright 2012 the V8 project authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #ifndef V8_OBJECTS_H_
 #define V8_OBJECTS_H_
 
 #include <iosfwd>
 
 #include "src/allocation.h"
@@ skipping 1463 matching lines @@
 #ifdef VERIFY_HEAP
   inline void VerifyObjectField(int offset);
   inline void VerifySmiField(int offset);
 
   // Verify a pointer is a valid HeapObject pointer that points to object
   // areas in the heap.
   static void VerifyHeapPointer(Object* p);
 #endif
 
   inline bool NeedsToEnsureDoubleAlignment();
+  inline bool NeedsToEnsureDoubleUnalignment();
 
   // Layout description.
   // First field in a heap object is map.
   static const int kMapOffset = Object::kHeaderSize;
   static const int kHeaderSize = kMapOffset + kPointerSize;
 
   STATIC_ASSERT(kMapOffset == Internals::kHeapObjectMapOffset);
 
  protected:
   // helpers for calling an ObjectVisitor to iterate over pointers in the
@@ skipping 9615 matching lines @@
     } else {
       value &= ~(1 << bit_position);
     }
     return value;
   }
 };
 
 } }  // namespace v8::internal
 
 #endif  // V8_OBJECTS_H_