Begins work on ARM64, first assembler test.

runtime/vm/debugger_test.cc

 // Copyright (c) 2013, 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 "vm/debugger.h"
 #include "vm/unit_test.h"
 
 namespace dart {
 
 TEST_CASE(Debugger_PrintBreakpointsToJSONArray) {
   const char* kScriptChars =
       "main() {\n"
       "  var x = new StringBuffer();\n"
       "  x.add('won');\n"
@@ skipping 82 matching lines @@
   // Set a breakpoint and run.
   debugger->SetBreakpointAtLine(url, 2);
   Dart_Handle result = Dart_Invoke(lib, NewString("main"), 0, NULL);
   EXPECT_VALID(result);
   EXPECT(Dart_IsString(result));
 
   // We ran the code in InspectPausedEvent.
   EXPECT(saw_paused_event);
 }
 
+}  // namespace dart
 
-
-}  // namespace dart
+#endif  // !defined(TARGET_ARCH_ARM64)