Avoid converting key to string for deleting of elements

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 804 matching lines @@
 
   // TODO(1240886): Some of the following methods are *not* handle safe, but
   // accept handle arguments. This seems fragile.
 
   // Support getting the characters in a string using [] notation as
   // in Firefox/SpiderMonkey, Safari and Opera.
   MUST_USE_RESULT static MaybeHandle<Object> GetElementOrCharAt(
       Isolate* isolate, Handle<Object> object, uint32_t index,
       LanguageMode language_mode = SLOPPY);
 
+  MUST_USE_RESULT static MaybeHandle<Object> DeleteObjectProperty(
+      Isolate* isolate, Handle<JSReceiver> receiver, Handle<Object> key,
+      LanguageMode language_mode);
+
   MUST_USE_RESULT static MaybeHandle<Object> SetObjectProperty(
       Isolate* isolate, Handle<Object> object, Handle<Object> key,
       Handle<Object> value, LanguageMode language_mode);
 
   MUST_USE_RESULT static MaybeHandle<Object> GetObjectProperty(
       Isolate* isolate, Handle<Object> object, Handle<Object> key,
       LanguageMode language_mode = SLOPPY);
 
   MUST_USE_RESULT static MaybeHandle<Object> KeyedGetObjectProperty(
       Isolate* isolate, Handle<Object> receiver_obj, Handle<Object> key_obj,
@@ skipping 101 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_