Avoid relying on monkey-patchable things in String.prototype.split.

test/mjsunit/regress/string-split-monkey-patching.js

Index: test/mjsunit/regress/string-split-monkey-patching.js
diff --git a/test/cctest/test-platform.cc b/test/mjsunit/regress/string-split-monkey-patching.js
similarity index 86%
copy from test/cctest/test-platform.cc
copy to test/mjsunit/regress/string-split-monkey-patching.js
index 6c20b853c5e7408b1877ee74617c01c3fc32ed5f..fe1b040fbfd8f823108014c59c5177a5bbb926e6 100644
--- a/test/cctest/test-platform.cc
+++ b/test/mjsunit/regress/string-split-monkey-patching.js
@@ -25,13 +25,11 @@
 // (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
 // OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 
-#include <stdlib.h>
+// Test that String.prototype.split with an regexp does not call the
+// monkey-patchable Array.prototy.push.
 
-#include "cctest.h"
-#include "platform.h"
-
-using namespace ::v8::internal;
-
-TEST(NumberOfCores) {
-  CHECK_GT(OS::NumberOfCores(), 0);
-}
+Array.prototype.push = assertUnreachable;
+"-".split(/-/);
+"I-must-not-use-push!".split(/-/);
+"Oh-no!".split(/(-)/);
+"a".split(/(a)|(b)/);