This is https://chromiumcodereview.appspot.com/10581006/ that I forgot to submit, and messed up the…

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 2538 matching lines @@
   }
 
   static intptr_t ic_data_offset() {
     return OFFSET_OF(RawICData, ic_data_);
   }
 
   static intptr_t function_offset() {
     return OFFSET_OF(RawICData, function_);
   }
 
-  void AddCheck(const GrowableArray<const Class*>& classes,
+  // Adds one more class test to ICData. Length of 'classes' must be equal to
+  // the number of arguments tested.
+  void AddCheck(const GrowableArray<intptr_t>& class_ids,
                 const Function& target) const;
   void GetCheckAt(intptr_t index,
-                  GrowableArray<const Class*>* classes,
+                  GrowableArray<intptr_t>* class_ids,
                   Function* target) const;
-  void GetOneClassCheckAt(int index, Class* cls, Function* target) const;
+  void GetOneClassCheckAt(
+      int index, intptr_t* class_id, Function* target) 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 2461 matching lines @@
 }
 
 
 intptr_t Stackmap::SizeInBits() const {
   return (Smi::Value(raw_ptr()->bitmap_size_in_bytes_) * kBitsPerByte);
 }
 
 }  // namespace dart
 
 #endif  // VM_OBJECT_H_