Begins work on ARM64, first assembler test.

runtime/vm/assembler_arm64_test.cc

Index: runtime/vm/assembler_arm64_test.cc
===================================================================
--- runtime/vm/assembler_arm64_test.cc	(revision 0)
+++ runtime/vm/assembler_arm64_test.cc	(revision 0)
@@ -0,0 +1,32 @@
+// 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.
+
+#include "vm/globals.h"
+#if defined(TARGET_ARCH_ARM64)
+
+#include "vm/assembler.h"
+#include "vm/cpu.h"
+#include "vm/os.h"
+#include "vm/unit_test.h"
+#include "vm/virtual_memory.h"
+
+namespace dart {
+
+#define __ assembler->
+
+ASSEMBLER_TEST_GENERATE(Simple, assembler) {
+  __ add(R0, ZR, Operand(ZR));
+  __ add(R0, R0, Operand(42));
+  __ ret();
+}
+
+
+ASSEMBLER_TEST_RUN(Simple, test) {
+  typedef int (*SimpleCode)();
+  EXPECT_EQ(42, EXECUTE_TEST_CODE_INT32(SimpleCode, test->entry()));
+}
+
+}  // namespace dart
+
+#endif  // defined(TARGET_ARCH_ARM64)