[utils] Lower kMinComplexMemCopy on 64-bit archs to 8

src/utils.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_UTILS_H_
 #define V8_UTILS_H_
 
 #include <limits.h>
 #include <stdlib.h>
 #include <string.h>
@@ skipping 490 matching lines @@
 }
 #else
 // Copy memory area to disjoint memory area.
 V8_INLINE void MemCopy(void* dest, const void* src, size_t size) {
   memcpy(dest, src, size);
 }
 V8_EXPORT_PRIVATE V8_INLINE void MemMove(void* dest, const void* src,
                                          size_t size) {
   memmove(dest, src, size);
 }
-const int kMinComplexMemCopy = 16 * kPointerSize;
+const int kMinComplexMemCopy = 8;
 #endif  // V8_TARGET_ARCH_IA32
 
 
 // ----------------------------------------------------------------------------
 // Miscellaneous
 
 // A static resource holds a static instance that can be reserved in
 // a local scope using an instance of Access.  Attempts to re-reserve
 // the instance will cause an error.
 template <typename T>
@@ skipping 1190 matching lines @@
  private:
   T value_;
   ThreadedListZoneEntry<T>* next_;
   DISALLOW_COPY_AND_ASSIGN(ThreadedListZoneEntry);
 };
 
 }  // namespace internal
 }  // namespace v8
 
 #endif  // V8_UTILS_H_