Fix error in test-heap.cc.

test/cctest/test-decls.cc

Index: test/cctest/test-decls.cc
===================================================================
--- test/cctest/test-decls.cc	(revision 2706)
+++ test/cctest/test-decls.cc	(working copy)
@@ -111,7 +111,7 @@
   if (is_initialized_) return;
   HandleScope scope;
   Local<FunctionTemplate> function = FunctionTemplate::New();
-  Local<Value> data = Integer::New(reinterpret_cast<intptr_t>(this));
+  Local<Value> data = External::New(this);
   GetHolder(function)->SetNamedPropertyHandler(&HandleGet,
                                                &HandleSet,
                                                &HandleHas,
@@ -179,8 +179,7 @@
 
 
 DeclarationContext* DeclarationContext::GetInstance(const AccessorInfo& info) {
-  Local<Value> data = info.Data();
-  return reinterpret_cast<DeclarationContext*>(Int32::Cast(*data)->Value());
+  return static_cast<DeclarationContext*>(External::Unwrap(info.Data()));
 }