Internalize strings in-place

src/builtins/builtins-object.cc

Index: src/builtins/builtins-object.cc
diff --git a/src/builtins/builtins-object.cc b/src/builtins/builtins-object.cc
index c9a9b7e164db121353e954b040f51172155d1551..5f90ecfb190a2eb54a5a42f75f9f99c3de775475 100644
--- a/src/builtins/builtins-object.cc
+++ b/src/builtins/builtins-object.cc
@@ -39,21 +39,24 @@ TF_BUILTIN(ObjectHasOwnProperty, ObjectBuiltinsAssembler) {
   Node* map = LoadMap(object);
   Node* instance_type = LoadMapInstanceType(map);
 
-  Variable var_index(this, MachineType::PointerRepresentation());
-
-  Label keyisindex(this), if_iskeyunique(this);
-  TryToName(key, &keyisindex, &var_index, &if_iskeyunique, &call_runtime);
-
-  Bind(&if_iskeyunique);
-  TryHasOwnProperty(object, map, instance_type, key, &return_true,
-                    &return_false, &call_runtime);
-
-  Bind(&keyisindex);
-  // Handle negative keys in the runtime.
-  GotoIf(IntPtrLessThan(var_index.value(), IntPtrConstant(0)), &call_runtime);
-  TryLookupElement(object, map, instance_type, var_index.value(), &return_true,
-                   &return_false, &call_runtime);
-
+  {
+    Variable var_index(this, MachineType::PointerRepresentation());
+    Variable var_unique(this, MachineRepresentation::kTagged);
+
+    Label keyisindex(this), if_iskeyunique(this);
+    TryToName(key, &keyisindex, &var_index, &if_iskeyunique, &var_unique,
+              &call_runtime);
+
+    Bind(&if_iskeyunique);
+    TryHasOwnProperty(object, map, instance_type, var_unique.value(),
+                      &return_true, &return_false, &call_runtime);
+
+    Bind(&keyisindex);
+    // Handle negative keys in the runtime.
+    GotoIf(IntPtrLessThan(var_index.value(), IntPtrConstant(0)), &call_runtime);
+    TryLookupElement(object, map, instance_type, var_index.value(),
+                     &return_true, &return_false, &call_runtime);
+  }
   Bind(&return_true);
   Return(BooleanConstant(true));