Fix vm code base so that it can be built for --arch=simarm (no snapshot yet).

runtime/vm/instructions_arm.cc

Index: runtime/vm/instructions_arm.cc
===================================================================
--- runtime/vm/instructions_arm.cc	(revision 0)
+++ runtime/vm/instructions_arm.cc	(revision 0)
@@ -0,0 +1,44 @@
+// 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"  // Needed here to get TARGET_ARCH_ARM.
+#if defined(TARGET_ARCH_ARM)
+
+#include "vm/instructions.h"
+#include "vm/object.h"
+
+namespace dart {
+
+bool InstructionPattern::TestBytesWith(const int* data, int num_bytes) const {
+  UNIMPLEMENTED();
+  return false;
+}
+
+
+uword CallOrJumpPattern::TargetAddress() const {
+  UNIMPLEMENTED();
+  return 0;
+}
+
+
+void CallOrJumpPattern::SetTargetAddress(uword target) const {
+  UNIMPLEMENTED();
+}
+
+
+const int* CallPattern::pattern() const {
+  UNIMPLEMENTED();
+  return NULL;
+}
+
+
+const int* JumpPattern::pattern() const {
+  UNIMPLEMENTED();
+  return NULL;
+}
+
+}  // namespace dart
+
+#endif  // defined TARGET_ARCH_ARM
+