Migrated several tests from blink to V8 repository.

test/webkit/dfg-arrayify-when-prevent-extensions.js

Index: test/webkit/dfg-arrayify-when-prevent-extensions.js
diff --git a/test/webkit/concat-while-having-a-bad-time.js b/test/webkit/dfg-arrayify-when-prevent-extensions.js
similarity index 85%
copy from test/webkit/concat-while-having-a-bad-time.js
copy to test/webkit/dfg-arrayify-when-prevent-extensions.js
index dfda1e08a0b36194b787a44ee12a9693acd8aeaf..78fb6bfebb5273ace7cc34bccb8b08b0bc0b60b2 100644
--- a/test/webkit/concat-while-having-a-bad-time.js
+++ b/test/webkit/dfg-arrayify-when-prevent-extensions.js
@@ -22,10 +22,16 @@
 // 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."
+"Tests that Arraify does good things when Object.preventExtensions() has been called."
 );
 
-Object.defineProperty(Array.prototype, 0, { writable: false });
-shouldBe("[42].concat()", "[42]");
-
+function foo(o) {
+    o[0] = 42;
+    return o[0];
+}
 
+for (var i = 0; i < 200; ++i) {
+    var o = {};
+    Object.preventExtensions(o);
+    shouldBe("foo(o)", "void 0");
+}