Use untagged int32 values in evaluation of side-effect free expressions.

src/virtual-frame.cc

 // Copyright 2009 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 145 matching lines @@
   if (!elements_[index].is_copy()) {
     info = elements_[index].number_info();
   } else {
     info = elements_[elements_[index].index()].number_info();
   }
   // The element is now in memory.  Its copied flag is preserved.
   FrameElement new_element = FrameElement::MemoryElement(info);
   if (elements_[index].is_copied()) {
     new_element.set_copied();
   }
+  if (elements_[index].is_untagged_int32()) {
+    new_element.set_untagged_int32(true);
+  }
   if (elements_[index].is_register()) {
     Unuse(elements_[index].reg());
   }
   elements_[index] = new_element;
 }
 
 
 // Clear the dirty bit for the element at a given index.
 void VirtualFrame::SyncElementAt(int index) {
   if (index <= stack_pointer_) {
@@ skipping 154 matching lines @@
 // Specialization of List::ResizeAdd to non-inlined version for FrameElements.
 // The function ResizeAdd becomes a real function, whose implementation is the
 // inlined ResizeAddInternal.
 template <>
 void List<FrameElement,
           FreeStoreAllocationPolicy>::ResizeAdd(const FrameElement& element) {
   ResizeAddInternal(element);
 }
 
 } }  // namespace v8::internal