Migrated several tests from blink to V8 repository.

test/webkit/string-index-overflow.js

Index: test/webkit/string-index-overflow.js
diff --git a/test/webkit/concat-while-having-a-bad-time.js b/test/webkit/string-index-overflow.js
similarity index 85%
copy from test/webkit/concat-while-having-a-bad-time.js
copy to test/webkit/string-index-overflow.js
index dfda1e08a0b36194b787a44ee12a9693acd8aeaf..362bbd01b237d5f3e844cf0fef6e4291c0af03da 100644
--- a/test/webkit/concat-while-having-a-bad-time.js
+++ b/test/webkit/string-index-overflow.js
@@ -22,10 +22,8 @@
 // SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 
 description(
-"Tests the behavior of Array.prototype.concat while the array is having a bad time due to one of the elements we are concatenating."
+"This test checks that accessing a string by an out of bounds index doesn't crash, furthermore the string should not appear to have out-of-bounds numeric properties."
 );
 
-Object.defineProperty(Array.prototype, 0, { writable: false });
-shouldBe("[42].concat()", "[42]");
-
-
+shouldBeUndefined('"x"[10]');
+shouldBeFalse('"x".hasOwnProperty(10)');