Sped up hashCode by removing megamorphic call to _identityHashCode.

runtime/vm/object.cc

 // 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.
 
 #include "vm/object.h"
 
 #include "include/dart_api.h"
 #include "platform/assert.h"
 #include "vm/assembler.h"
 #include "vm/become.h"
@@ skipping 12830 matching lines @@
   // Set count to 0 as this is called during compilation, before the
   // call has been executed.
   const Smi& value = Smi::Handle(Smi::New(0));
   data.SetAt(data_pos, value);
   // Multithreaded access to ICData requires setting of array to be the last
   // operation.
   set_ic_data_array(data);
 }
 
 
+bool ICData::ValidateInteceptor(const Function& target) const {
+  ObjectStore* store = Isolate::Current()->object_store();
+  ASSERT(target.raw() == store->simple_instance_of_true_function()
+         || target.raw() == store->simple_instance_of_false_function());
+  const String& instance_of_name = String::Handle(
+      Library::PrivateCoreLibName(Symbols::_simpleInstanceOf()).raw());
+  ASSERT(target_name() == instance_of_name.raw());
+  return true;
+}
+
 void ICData::AddCheck(const GrowableArray<intptr_t>& class_ids,
                       const Function& target) const {
   ASSERT(!target.IsNull());
-  ASSERT(target.name() == target_name());
+  ASSERT(target.name() == target_name() || ValidateInteceptor(target));
   DEBUG_ASSERT(!HasCheck(class_ids));
   ASSERT(NumArgsTested() > 1);  // Otherwise use 'AddReceiverCheck'.
   ASSERT(class_ids.length() == NumArgsTested());
   const intptr_t old_num = NumberOfChecks();
   Array& data = Array::Handle(ic_data());
   // ICData of static calls with NumArgsTested() > 0 have initially a
   // dummy set of cids entered (see ICData::AddTarget). That entry is
   // overwritten by first real type feedback data.
   if (old_num == 1) {
     bool has_dummy_entry = true;
@@ skipping 9729 matching lines @@
   return UserTag::null();
 }
 
 
 const char* UserTag::ToCString() const {
   const String& tag_label = String::Handle(label());
   return tag_label.ToCString();
 }
 
 }  // namespace dart