Sped up hashCode by removing megamorphic call to _identityHashCode.

runtime/vm/object.h

 // Copyright (c) 2012, the Dart project authors.  Please see the AUTHORS file
 // for details. All rights reserved. Use of this source code is governed by a
 // BSD-style license that can be found in the LICENSE file.
 
 #ifndef VM_OBJECT_H_
 #define VM_OBJECT_H_
 
 #include "include/dart_api.h"
 #include "platform/assert.h"
 #include "platform/utils.h"
@@ skipping 2072 matching lines @@
   }
 
   void set_owner(const Function& value) const;
   void set_target_name(const String& value) const;
   void set_arguments_descriptor(const Array& value) const;
   void set_deopt_id(intptr_t value) const;
   void SetNumArgsTested(intptr_t value) const;
   void set_ic_data_array(const Array& value) const;
   void set_state_bits(uint32_t bits) const;
 
+  bool ValidateInteceptor(const Function& target) const;
+
   enum {
     kNumArgsTestedPos = 0,
     kNumArgsTestedSize = 2,
     kDeoptReasonPos = kNumArgsTestedPos + kNumArgsTestedSize,
     kDeoptReasonSize = kLastRecordedDeoptReason + 1,
     kStaticCallPos = kDeoptReasonPos + kDeoptReasonSize,
     kStaticCallSize = 1,
   };
 
   class NumArgsTestedBits : public BitField<uint32_t,
@@ skipping 6552 matching lines @@
 
 inline void TypeArguments::SetHash(intptr_t value) const {
   // This is only safe because we create a new Smi, which does not cause
   // heap allocation.
   StoreSmi(&raw_ptr()->hash_, Smi::New(value));
 }
 
 }  // namespace dart
 
 #endif  // VM_OBJECT_H_