Begins work on ARM64, first assembler test.

runtime/vm/dart_entry_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.
 
+// TODO(zra): Remove when tests are ready to enable.
+#include "platform/globals.h"
+#if !defined(TARGET_ARCH_ARM64)
+
 #include "platform/assert.h"
 #include "vm/assembler.h"
 #include "vm/class_finalizer.h"
 #include "vm/compiler.h"
 #include "vm/dart_entry.h"
 #include "vm/object.h"
 #include "vm/resolver.h"
 #include "vm/symbols.h"
 #include "vm/unit_test.h"
 
@@ skipping 89 matching lines @@
   EXPECT(!function.IsNull());
   const Array& args = Array::Handle(Array::New(1));
   args.SetAt(0, instance);
   const Object& retval = Object::Handle(DartEntry::InvokeFunction(function,
                                                                   args));
   EXPECT(retval.IsError());
   EXPECT_SUBSTRING("++++", Error::Cast(retval).ToErrorCString());
 }
 
 }  // namespace dart
+
+#endif  // !defined(TARGET_ARCH_ARM64)