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

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

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-#include <stdlib.h>
+// Test that String.prototype.split with an regexp does not call the
+// monkey-patchable Array.prototype.push or PutValue.
 
-#include "cctest.h"
-#include "platform.h"
+Array.prototype.push = assertUnreachable;
 
-using namespace ::v8::internal;
+Object.defineProperty(Array.prototype, "0", {
+  get: assertUnreachable,
+  set: assertUnreachable });
 
-TEST(NumberOfCores) {
-  CHECK_GT(OS::NumberOfCores(), 0);
-}
+"-".split(/-/);
+"I-must-not-use-push!".split(/-/);
+"Oh-no!".split(/(-)/);
+"a".split(/(a)|(b)/);