AllocationSite objects weakly linked for traversal

src/ia32/lithium-ia32.cc

Index: src/ia32/lithium-ia32.cc
diff --git a/src/ia32/lithium-ia32.cc b/src/ia32/lithium-ia32.cc
index 24ee7bff2b67049675bd1ce4b1fccf75988cf780..aebe26b78560b98a8894ca98fae0a25e4c295eae 100644
--- a/src/ia32/lithium-ia32.cc
+++ b/src/ia32/lithium-ia32.cc
@@ -302,6 +302,24 @@ void LCallConstantFunction::PrintDataTo(StringStream* stream) {
 }
 
 
+ExternalReference LLinkObjectInList::GetReference(Isolate* isolate) {
+  switch (hydrogen()->known_list()) {
+    case HLinkObjectInList::ALLOCATION_SITE_LIST:
+      return ExternalReference::allocation_sites_list_address(isolate);
+  }
+
+  UNREACHABLE();
+  // Return a dummy value
+  return ExternalReference::isolate_address(isolate);
+}
+
+
+void LLinkObjectInList::PrintDataTo(StringStream* stream) {
+  object()->PrintTo(stream);
+  stream->Add(" offset %d", hydrogen()->store_field().offset());
+}
+
+
 void LLoadContextSlot::PrintDataTo(StringStream* stream) {
   context()->PrintTo(stream);
   stream->Add("[%d]", slot_index());
@@ -2162,6 +2180,14 @@ LInstruction* LChunkBuilder::DoStoreGlobalGeneric(HStoreGlobalGeneric* instr) {
 }
 
 
+LInstruction* LChunkBuilder::DoLinkObjectInList(HLinkObjectInList* instr) {
+  LOperand* object = UseRegister(instr->value());
+  LOperand* temp = TempRegister();
+  LLinkObjectInList* result = new(zone()) LLinkObjectInList(object, temp);
+  return result;
+}
+
+
 LInstruction* LChunkBuilder::DoLoadContextSlot(HLoadContextSlot* instr) {
   LOperand* context = UseRegisterAtStart(instr->value());
   LInstruction* result =