Initial SIMDBC interpreter.

runtime/vm/cpu_dbc.h

Index: runtime/vm/cpu_dbc.h
diff --git a/runtime/vm/cpu_dbc.h b/runtime/vm/cpu_dbc.h
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index 0000000000000000000000000000000000000000..b437beb36c3ae2922dd6511e5c1fcb9572ea2109
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+++ b/runtime/vm/cpu_dbc.h
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+// Copyright (c) 2016, 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.
+
+#ifndef VM_CPU_DBC_H_
+#define VM_CPU_DBC_H_
+
+#include "vm/allocation.h"
+#include "vm/simulator.h"
+
+namespace dart {
+
+class HostCPUFeatures: public AllStatic {
+ public:
+  static const char* hardware() { return "simdbc"; }
+};
+
+class TargetCPUFeatures : public AllStatic {
+ public:
+  static void InitOnce() {}
+  static void Cleanup() {}
+
+  static bool double_truncate_round_supported() {
+    return true;
+  }
+};
+
+}  // namespace dart
+
+#endif  // VM_CPU_DBC_H_