Remove write-barriers for stores to new-space objects.

src/hydrogen-instructions.cc

 // 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 444 matching lines @@
   if (changes_flags == AllSideEffectsFlagSet()) {
     stream->Add("*");
   } else {
     bool add_comma = false;
 #define PRINT_DO(type)                            \
     if (changes_flags.Contains(kChanges##type)) { \
       if (add_comma) stream->Add(",");            \
       add_comma = true;                           \
       stream->Add(#type);                         \
     }
-    GVN_FLAG_LIST(PRINT_DO);
+    GVN_TRACKED_FLAG_LIST(PRINT_DO);
+    GVN_UNTRACKED_FLAG_LIST(PRINT_DO);
 #undef PRINT_DO
   }
   stream->Add("]");
 }
 
 
 void HValue::PrintNameTo(StringStream* stream) {
   stream->Add("%s%d", representation_.Mnemonic(), id());
 }
 
@@ skipping 1250 matching lines @@
 }
 
 
 void HStoreNamedField::PrintDataTo(StringStream* stream) {
   object()->PrintNameTo(stream);
   stream->Add(".");
   stream->Add(*String::cast(*name())->ToCString());
   stream->Add(" = ");
   value()->PrintNameTo(stream);
   stream->Add(" @%d%s", offset(), is_in_object() ? "[in-object]" : "");
+  if (NeedsWriteBarrier()) {
+    stream->Add(" (write-barrier)");
+  }
   if (!transition().is_null()) {
     stream->Add(" (transition map %p)", *transition());
   }
 }
 
 
 void HStoreKeyedFastElement::PrintDataTo(StringStream* stream) {
   object()->PrintNameTo(stream);
   stream->Add("[");
   key()->PrintNameTo(stream);
@@ skipping 588 matching lines @@
 
 
 void HCheckPrototypeMaps::Verify() {
   HInstruction::Verify();
   ASSERT(HasNoUses());
 }
 
 #endif
 
 } }  // namespace v8::internal