Refactors CPU feature detection.

runtime/vm/cpu_mips.h

Index: runtime/vm/cpu_mips.h
===================================================================
--- runtime/vm/cpu_mips.h	(revision 0)
+++ runtime/vm/cpu_mips.h	(revision 0)
@@ -0,0 +1,35 @@
+// 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.
+
+#ifndef VM_CPU_MIPS_H_
+#define VM_CPU_MIPS_H_
+
+#include "vm/allocation.h"
+
+namespace dart {
+
+class HostCPUFeatures: public AllStatic {

[Ivan Posva, 2014/01/21 21:41:02]

Don't you support the same simulator overriding capability here? Maybe add the
same comment as in ARM.

[zra, 2014/01/24 21:18:27]

Done.

+ public:
+  static void InitOnce();
+  static char* hardware() {
+    DEBUG_ASSERT(initialized_);
+    return hardware_;
+  }
+
+ private:
+  static char* hardware_;
+#if defined(DEBUG)
+  static bool initialized_;
+#endif
+};
+
+class TargetCPUFeatures : public AllStatic {
+ public:
+  static void InitOnce() { HostCPUFeatures::InitOnce(); }
+  static bool double_truncate_round_supported() { return false; }
+};
+
+}  // namespace dart
+
+#endif  // VM_CPU_MIPS_H_