Simplify and fix implicit closure check, speed up Closure_equals

runtime/vm/raw_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 RUNTIME_VM_RAW_OBJECT_H_
 #define RUNTIME_VM_RAW_OBJECT_H_
 
 #include "platform/assert.h"
 #include "vm/atomic.h"
 #include "vm/exceptions.h"
@@ skipping 813 matching lines @@
   RawObject** to() { return reinterpret_cast<RawObject**>(&ptr()->script_); }
 
   friend class Function;
 };
 
 class RawFunction : public RawObject {
  public:
   enum Kind {
     kRegularFunction,
     kClosureFunction,
+    kImplicitClosureFunction,
     kConvertedClosureFunction,
     kSignatureFunction,  // represents a signature only without actual code.
     kGetterFunction,     // represents getter functions e.g: get foo() { .. }.
     kSetterFunction,     // represents setter functions e.g: set foo(..) { .. }.
     kConstructor,
     kImplicitGetter,             // represents an implicit getter for fields.
     kImplicitSetter,             // represents an implicit setter for fields.
     kImplicitStaticFinalGetter,  // represents an implicit getter for static
                                  // final fields (incl. static const fields).
     kMethodExtractor,  // converts method into implicit closure on the receiver.
@@ skipping 1593 matching lines @@
   COMPILE_ASSERT(kExternalTypedDataInt8ArrayCid ==
                  kTypedDataInt8ArrayViewCid + 15);
   COMPILE_ASSERT(kByteBufferCid == kExternalTypedDataInt8ArrayCid + 14);
   COMPILE_ASSERT(kNullCid == kByteBufferCid + 1);
   return (kNullCid - kTypedDataInt8ArrayCid);
 }
 
 }  // namespace dart
 
 #endif  // RUNTIME_VM_RAW_OBJECT_H_