Begins work on ARM64, first assembler test.

runtime/vm/cpu_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/cpu.h"
 #include "vm/globals.h"
 #include "vm/unit_test.h"
 
 namespace dart {
 
 UNIT_TEST_CASE(Id) {
 #if defined(TARGET_ARCH_IA32)
   EXPECT_STREQ("ia32", CPU::Id());
 #elif defined(TARGET_ARCH_X64)
   EXPECT_STREQ("x64", CPU::Id());
 #elif defined(TARGET_ARCH_ARM)
 #if defined(HOST_ARCH_ARM)
   EXPECT_STREQ("arm", CPU::Id());
 #else  // defined(HOST_ARCH_ARM)
   EXPECT_STREQ("simarm", CPU::Id());
 #endif  // defined(HOST_ARCH_ARM)
+#elif defined(TARGET_ARCH_ARM64)
+#if defined(HOST_ARCH_ARM64)
+  EXPECT_STREQ("arm64", CPU::Id());
+#else  // defined(HOST_ARCH_ARM64)
+  EXPECT_STREQ("simarm64", CPU::Id());
+#endif  // defined(HOST_ARCH_ARM64)
 #elif defined(TARGET_ARCH_MIPS)
 #if defined(HOST_ARCH_MIPS)
   EXPECT_STREQ("mips", CPU::Id());
 #else  // defined(HOST_ARCH_MIPS)
   EXPECT_STREQ("simmips", CPU::Id());
 #endif  // defined(HOST_ARCH_MIPS)
 #else
 #error Architecture was not detected as supported by Dart.
 #endif
 }
 
 }  // namespace dart