Fix build failure on Win64 since r14458.

src/frames-inl.h

 // Copyright 2012 the V8 project authors. All rights reserved.
 // Redistribution and use in source and binary forms, with or without
 // modification, are permitted provided that the following conditions are
 // met:
 //
 //     * Redistributions of source code must retain the above copyright
 //       notice, this list of conditions and the following disclaimer.
 //     * Redistributions in binary form must reproduce the above
 //       copyright notice, this list of conditions and the following
 //       disclaimer in the documentation and/or other materials provided
@@ skipping 218 matching lines @@
 
 
 inline int JavaScriptFrame::ComputeOperandsCount() const {
   Address base = fp() + JavaScriptFrameConstants::kLocal0Offset;
   // Base points to low address of first operand and stack grows down, so add
   // kPointerSize to get the actual stack size.
   intptr_t stack_size_in_bytes = (base + kPointerSize) - sp();
   ASSERT(IsAligned(stack_size_in_bytes, kPointerSize));
   ASSERT(type() == JAVA_SCRIPT);
   ASSERT(stack_size_in_bytes >= 0);
-  return stack_size_in_bytes >> kPointerSizeLog2;
+  return static_cast<int>(stack_size_in_bytes >> kPointerSizeLog2);
 }
 
 
 inline Object* JavaScriptFrame::receiver() const {
   return GetParameter(-1);
 }
 
 
 inline void JavaScriptFrame::set_receiver(Object* value) {
   Memory::Object_at(GetParameterSlot(-1)) = value;
@@ skipping 106 matching lines @@
 template<typename Iterator>
 void JavaScriptFrameIteratorTemp<Iterator>::Reset() {
   iterator_.Reset();
   if (!done()) Advance();
 }
 
 
 } }  // namespace v8::internal
 
 #endif  // V8_FRAMES_INL_H_