Revert of 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 f216508c23c3952d8b67a000f8636cdfff34120a..6b2d5865103005bec4d78e82cdc5debd8ad126f5 100644
--- a/src/builtins/builtins-object.cc
+++ b/src/builtins/builtins-object.cc
@@ -37,26 +37,24 @@
   Node* map = assembler.LoadMap(object);
   Node* instance_type = assembler.LoadMapInstanceType(map);
 
-  {
-    Variable var_index(&assembler, MachineType::PointerRepresentation());
-    Variable var_unique(&assembler, MachineRepresentation::kTagged);
-
-    Label keyisindex(&assembler), if_iskeyunique(&assembler);
-    assembler.TryToName(key, &keyisindex, &var_index, &if_iskeyunique,
-                        &var_unique, &call_runtime);
-
-    assembler.Bind(&if_iskeyunique);
-    assembler.TryHasOwnProperty(object, map, instance_type, var_unique.value(),
-                                &return_true, &return_false, &call_runtime);
-
-    assembler.Bind(&keyisindex);
-    // Handle negative keys in the runtime.
-    assembler.GotoIf(assembler.IntPtrLessThan(var_index.value(),
-                                              assembler.IntPtrConstant(0)),
-                     &call_runtime);
-    assembler.TryLookupElement(object, map, instance_type, var_index.value(),
-                               &return_true, &return_false, &call_runtime);
-  }
+  Variable var_index(&assembler, MachineType::PointerRepresentation());
+
+  Label keyisindex(&assembler), if_iskeyunique(&assembler);
+  assembler.TryToName(key, &keyisindex, &var_index, &if_iskeyunique,
+                      &call_runtime);
+
+  assembler.Bind(&if_iskeyunique);
+  assembler.TryHasOwnProperty(object, map, instance_type, key, &return_true,
+                              &return_false, &call_runtime);
+
+  assembler.Bind(&keyisindex);
+  // Handle negative keys in the runtime.
+  assembler.GotoIf(
+      assembler.IntPtrLessThan(var_index.value(), assembler.IntPtrConstant(0)),
+      &call_runtime);
+  assembler.TryLookupElement(object, map, instance_type, var_index.value(),
+                             &return_true, &return_false, &call_runtime);
+
   assembler.Bind(&return_true);
   assembler.Return(assembler.BooleanConstant(true));