Get rid of HLinkObjectInList.

src/x64/lithium-x64.cc

Index: src/x64/lithium-x64.cc
diff --git a/src/x64/lithium-x64.cc b/src/x64/lithium-x64.cc
index 4153417473e24e4dfc2d915799b294dc3c4413d5..4ecb733508ebb544099c352acd67045dc2c32d7f 100644
--- a/src/x64/lithium-x64.cc
+++ b/src/x64/lithium-x64.cc
@@ -275,24 +275,6 @@ 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());
@@ -2042,13 +2024,6 @@ LInstruction* LChunkBuilder::DoStoreGlobalGeneric(HStoreGlobalGeneric* instr) {
 }
 
 
-LInstruction* LChunkBuilder::DoLinkObjectInList(HLinkObjectInList* instr) {
-  LOperand* object = UseRegister(instr->value());
-  LLinkObjectInList* result = new(zone()) LLinkObjectInList(object);
-  return result;
-}
-
-
 LInstruction* LChunkBuilder::DoLoadContextSlot(HLoadContextSlot* instr) {
   LOperand* context = UseRegisterAtStart(instr->value());
   LInstruction* result =