Cache hash code for closures.

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/globals.h"
@@ skipping 844 matching lines @@
  private:
   RAW_HEAP_OBJECT_IMPLEMENTATION(ClosureData);
 
   RawObject** from() {
     return reinterpret_cast<RawObject**>(&ptr()->context_scope_);
   }
   RawContextScope* context_scope_;
   RawFunction* parent_function_;  // Enclosing function of this local function.
   RawType* signature_type_;
   RawInstance* closure_;  // Closure object for static implicit closures.
-  RawObject** to() { return reinterpret_cast<RawObject**>(&ptr()->closure_); }
+  RawObject** to_snapshot() {
+    return reinterpret_cast<RawObject**>(&ptr()->closure_);
+  }
+  RawObject* hash_;
+  RawObject** to() { return reinterpret_cast<RawObject**>(&ptr()->hash_); }
 
   friend class Function;
 };
 
 
 class RawSignatureData : public RawObject {
  private:
   RAW_HEAP_OBJECT_IMPLEMENTATION(SignatureData);
 
   RawObject** from() {
@@ skipping 1542 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_