Refactors CPU feature detection.

runtime/vm/cpuinfo_test.cc

Index: runtime/vm/cpuinfo_test.cc
===================================================================
--- runtime/vm/cpuinfo_test.cc	(revision 0)
+++ runtime/vm/cpuinfo_test.cc	(revision 0)
@@ -0,0 +1,19 @@
+// 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/cpuinfo.h"
+#include "vm/globals.h"
+#include "vm/unit_test.h"
+
+namespace dart {
+
+UNIT_TEST_CASE(GetCpuModelTest) {
+  CpuInfo::InitOnce();
+  char* cpumodel = CpuInfo::GetCpuModel();
+  EXPECT_NE(strlen(cpumodel), 0UL);
+  delete[] cpumodel;
+}
+
+}  // namespace dart