[ic] LoadGlobalIC caches PropertyCells in the feedback vector.

src/runtime/runtime-object.cc

Index: src/runtime/runtime-object.cc
diff --git a/src/runtime/runtime-object.cc b/src/runtime/runtime-object.cc
index 4f685cf0f77411055c8cb5a72a7dcddcb155907a..32fc1abea3ea259d0289eec0782dc5cfc01faca6 100644
--- a/src/runtime/runtime-object.cc
+++ b/src/runtime/runtime-object.cc
@@ -274,40 +274,6 @@ RUNTIME_FUNCTION(Runtime_OptimizeObjectForAddingMultipleProperties) {
 }
 
 
-RUNTIME_FUNCTION(Runtime_LoadGlobalViaContext) {
-  HandleScope scope(isolate);
-  DCHECK_EQ(1, args.length());
-  CONVERT_SMI_ARG_CHECKED(slot, 0);
-
-  // Go up context chain to the script context.
-  Handle<Context> script_context(isolate->context()->script_context(), isolate);
-  DCHECK(script_context->IsScriptContext());
-  DCHECK(script_context->get(slot)->IsPropertyCell());
-
-  // Lookup the named property on the global object.
-  Handle<ScopeInfo> scope_info(script_context->scope_info(), isolate);
-  Handle<Name> name(scope_info->ContextSlotName(slot), isolate);
-  Handle<JSGlobalObject> global_object(script_context->global_object(),
-                                       isolate);
-  LookupIterator it(global_object, name, global_object, LookupIterator::OWN);
-
-  // Switch to fast mode only if there is a data property and it's not on
-  // a hidden prototype.
-  if (it.state() == LookupIterator::DATA &&
-      it.GetHolder<Object>().is_identical_to(global_object)) {
-    // Now update the cell in the script context.
-    Handle<PropertyCell> cell = it.GetPropertyCell();
-    script_context->set(slot, *cell);
-  } else {
-    // This is not a fast case, so keep this access in a slow mode.
-    // Store empty_property_cell here to release the outdated property cell.
-    script_context->set(slot, isolate->heap()->empty_property_cell());
-  }
-
-  RETURN_RESULT_OR_FAILURE(isolate, Object::GetProperty(&it));
-}
-
-
 namespace {
 
 Object* StoreGlobalViaContext(Isolate* isolate, int slot, Handle<Object> value,