[api] Use shallow copy for the template instantiation cache

src/objects.h

 // Copyright 2015 the V8 project authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #ifndef V8_OBJECTS_H_
 #define V8_OBJECTS_H_
 
 #include <iosfwd>
 
 #include "src/assert-scope.h"
@@ skipping 2362 matching lines @@
   // Called the first time an object is observed with ES7 Object.observe.
   static void SetObserved(Handle<JSObject> object);
 
   // Copy object.
   enum DeepCopyHints { kNoHints = 0, kObjectIsShallow = 1 };
 
   MUST_USE_RESULT static MaybeHandle<JSObject> DeepCopy(
       Handle<JSObject> object,
       AllocationSiteUsageContext* site_context,
       DeepCopyHints hints = kNoHints);
-  // Deep copies given object with special handling for JSFunctions which
-  // 1) must be Api functions and 2) are not copied but left as is.
-  MUST_USE_RESULT static MaybeHandle<JSObject> DeepCopyApiBoilerplate(
-      Handle<JSObject> object);
   MUST_USE_RESULT static MaybeHandle<JSObject> DeepWalk(
       Handle<JSObject> object,
       AllocationSiteCreationContext* site_context);
 
   DECLARE_CAST(JSObject)
 
   // Dispatched behavior.
   void JSObjectShortPrint(StringStream* accumulator);
   DECLARE_PRINTER(JSObject)
   DECLARE_VERIFIER(JSObject)
@@ skipping 8482 matching lines @@
     }
     return value;
   }
 };
 
 
 }  // NOLINT, false-positive due to second-order macros.
 }  // NOLINT, false-positive due to second-order macros.
 
 #endif  // V8_OBJECTS_H_