[ic] Fix megamorphic stub cache probing on some platforms.

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 3751 matching lines @@
 
   // Type specific at put (default NONE attributes is used when adding).
   MUST_USE_RESULT static Handle<UnseededNumberDictionary> AtNumberPut(
       Handle<UnseededNumberDictionary> dictionary,
       uint32_t key,
       Handle<Object> value);
   MUST_USE_RESULT static Handle<UnseededNumberDictionary> AddNumberEntry(
       Handle<UnseededNumberDictionary> dictionary,
       uint32_t key,
       Handle<Object> value);
+  static Handle<UnseededNumberDictionary> DeleteKey(
+      Handle<UnseededNumberDictionary> dictionary, uint32_t key);
 
   // Set an existing entry or add a new one if needed.
   // Return the updated dictionary.
   MUST_USE_RESULT static Handle<UnseededNumberDictionary> Set(
       Handle<UnseededNumberDictionary> dictionary,
       uint32_t key,
       Handle<Object> value);
 
   static const int kEntryValueIndex = 1;
   static const int kEntryDetailsIndex = 2;
@@ skipping 7211 matching lines @@
     }
     return value;
   }
 };
 
 
 }  // NOLINT, false-positive due to second-order macros.
 }  // NOLINT, false-positive due to second-order macros.
 
 #endif  // V8_OBJECTS_H_