Revert Dart_PropagateError until I can track down the problems in

runtime/vm/code_generator_x64_test.cc

 // 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.
 
 #include "platform/assert.h"
 #include "vm/globals.h"
 #if defined(TARGET_ARCH_X64)
 
 #include "vm/ast.h"
 #include "vm/assembler.h"
@@ skipping 467 matching lines @@
   const TypeArguments& no_type_arguments = TypeArguments::ZoneHandle();
   ArgumentListNode* no_arguments = new ArgumentListNode(kPos);
   test->node_sequence()->Add(new ReturnNode(kPos, new ConstructorCallNode(
       kPos, no_type_arguments, constructor, no_arguments)));
 }
 
 
 CODEGEN_TEST_RAW_RUN(AllocateNewObjectCodegen, function) {
   GrowableArray<const Object*> arguments;
   const Array& kNoArgumentNames = Array::Handle();
-  Object& result = Object::Handle();
+  Instance& result = Instance::Handle();
   result = DartEntry::InvokeStatic(function, arguments, kNoArgumentNames);
-  EXPECT(!result.IsError());
   const Library& app_lib = Library::Handle(
       Isolate::Current()->object_store()->registered_libraries());
   const Class& cls = Class::Handle(
       app_lib.LookupClass(String::Handle(String::NewSymbol("A"))));
   EXPECT_EQ(cls.raw(), result.clazz());
 }
 
 }  // namespace dart
 
 #endif  // defined TARGET_ARCH_X64