Equality compare should record two arguments in IC data. INline double equality comparison.

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 2646 matching lines @@
   void GetCheckAt(intptr_t index,
                   GrowableArray<intptr_t>* class_ids,
                   Function* target) const;
   void GetOneClassCheckAt(
       int index, intptr_t* class_id, Function* target) const;
 
   intptr_t GetReceiverClassIdAt(intptr_t index) const;
   RawFunction* GetTargetAt(intptr_t index) const;
   RawFunction* GetTargetForReceiverClassId(intptr_t class_id) const;
 
+  // Returns this->raw() if num_args_tested == 1, otherwise returns a new
+  // ICData object containing only unique arg0 checks.
+  RawICData* AsUnaryClassChecks() const;
+
   static RawICData* New(const Function& caller_function,
                         const String& target_name,
                         intptr_t id,
                         intptr_t num_args_tested);
 
  private:
   RawArray* ic_data() const {
     return raw_ptr()->ic_data_;
   }
 
@@ skipping 2453 matching lines @@
 }
 
 
 intptr_t Stackmap::SizeInBits() const {
   return (Smi::Value(raw_ptr()->bitmap_size_in_bytes_) * kBitsPerByte);
 }
 
 }  // namespace dart
 
 #endif  // VM_OBJECT_H_