Determine number of available cores on all platforms.

test/cctest/test-platform.cc

Index: test/cctest/test-platform.cc
diff --git a/test/mjsunit/regress/regress-crbug-172345.js b/test/cctest/test-platform.cc
similarity index 91%
copy from test/mjsunit/regress/regress-crbug-172345.js
copy to test/cctest/test-platform.cc
index 711501caa791f2974635ac4dd894568a2e3fc982..6c20b853c5e7408b1877ee74617c01c3fc32ed5f 100644
--- a/test/mjsunit/regress/regress-crbug-172345.js
+++ b/test/cctest/test-platform.cc
@@ -25,10 +25,13 @@
 // (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
 // OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 
-function f(a,i) {
-  return a[i];
-}
+#include <stdlib.h>
+
+#include "cctest.h"
+#include "platform.h"
 
-f([1,2,3], "length");
-f([1,2,3], "length");
-f([1,2,3], 2);
+using namespace ::v8::internal;
+
+TEST(NumberOfCores) {
+  CHECK_GT(OS::NumberOfCores(), 0);
+}