Updates refactoring of CPU feature detection

runtime/vm/cpuid.h

Index: runtime/vm/cpuid.h
===================================================================
--- runtime/vm/cpuid.h	(revision 0)
+++ runtime/vm/cpuid.h	(revision 0)
@@ -0,0 +1,48 @@
+// Copyright (c) 2014, 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_CPUID_H_
+#define VM_CPUID_H_
+
+#include "vm/globals.h"
+#if !defined(TARGET_OS_MACOS)
+#include "vm/allocation.h"
+#include "vm/cpuinfo.h"
+
+namespace dart {
+
+class CpuId : public AllStatic {
+ public:
+#if defined(HOST_ARCH_IA32) || defined(HOST_ARCH_X64)
+  static void InitOnce();
+  static void Cleanup();
+
+  // Caller must free the result of field.
+  static const char* field(CpuInfoIndices idx);
+#else
+  static void InitOnce() {}
+  static void Cleanup() {}
+  static const char* field(CpuInfoIndices idx) { return NULL; }
+#endif
+
+  static bool sse2() { return sse2_; }
+  static bool sse41() { return sse41_; }
+
+  // Caller must free the result of id_string and brand_string.
+  static const char* id_string();
+  static const char* brand_string();
+
+ private:
+  static bool sse2_;
+  static bool sse41_;
+  static const char* id_string_;
+  static const char* brand_string_;
+
+  static void GetCpuId(int32_t level, uint32_t info[4]);
+};
+
+}  // namespace dart
+
+#endif  // !defined(TARGET_OS_MACOS)
+#endif  // VM_CPUID_H_