Expose Map/Set methods through the API

src/runtime/runtime.h

 // Copyright 2012 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_RUNTIME_RUNTIME_H_
 #define V8_RUNTIME_RUNTIME_H_
 
 #include "src/allocation.h"
 #include "src/objects.h"
 #include "src/zone.h"
@@ skipping 854 matching lines @@
                                    ElementsKind* fixed_elements_kind,
                                    size_t* element_size);
 
   // Used in runtime.cc and hydrogen's VisitArrayLiteral.
   MUST_USE_RESULT static MaybeHandle<Object> CreateArrayLiteralBoilerplate(
       Isolate* isolate, Handle<FixedArray> literals,
       Handle<FixedArray> elements, bool is_strong);
 
 
   static void JSMapInitialize(Isolate* isolate, Handle<JSMap> map);
+  static void JSMapClear(Isolate* isolate, Handle<JSMap> map);
   static void JSSetInitialize(Isolate* isolate, Handle<JSSet> set);
+  static void JSSetClear(Isolate* isolate, Handle<JSSet> set);
 
   static void WeakCollectionInitialize(
       Isolate* isolate, Handle<JSWeakCollection> weak_collection);
   static void WeakCollectionSet(Handle<JSWeakCollection> weak_collection,
                                 Handle<Object> key, Handle<Object> value,
                                 int32_t hash);
   static bool WeakCollectionDelete(Handle<JSWeakCollection> weak_collection,
                                    Handle<Object> key);
   static bool WeakCollectionDelete(Handle<JSWeakCollection> weak_collection,
                                    Handle<Object> key, int32_t hash);
@@ skipping 38 matching lines @@
 inline bool Runtime::AtomicIsLockFree(uint32_t size) {
   return size == 1 || size == 2 || size == 4;
 }
 
 #endif
 
 }  // namespace internal
 }  // namespace v8
 
 #endif  // V8_RUNTIME_RUNTIME_H_