Migrated several tests from blink to V8 repository.

test/webkit/dfg-put-by-id-prototype-check.js

Index: test/webkit/dfg-put-by-id-prototype-check.js
diff --git a/test/webkit/concat-while-having-a-bad-time.js b/test/webkit/dfg-put-by-id-prototype-check.js
similarity index 73%
copy from test/webkit/concat-while-having-a-bad-time.js
copy to test/webkit/dfg-put-by-id-prototype-check.js
index dfda1e08a0b36194b787a44ee12a9693acd8aeaf..a8b61374ef5af987f1741f22c72db35cfa69c872 100644
--- a/test/webkit/concat-while-having-a-bad-time.js
+++ b/test/webkit/dfg-put-by-id-prototype-check.js
@@ -22,10 +22,31 @@
 // 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 the DFG CFA is not overzealous in removing prototype structure checks for put_by_id transitions."
 );
 
-Object.defineProperty(Array.prototype, 0, { writable: false });
-shouldBe("[42].concat()", "[42]");
+function foo(a, b)
+{
+    a.f = b;
+}
 
+var Empty = "";
+
+function Foo() {
+}
+
+var stuff;
+
+for (var i = 0; i < 1000; ++i) {
+    if (i >= 900)
+        Foo.prototype.__defineSetter__("f", function(value) { stuff = value; });
+
+    var o = new Foo();
+    eval(Empty + "foo(o, i)");
+    if (i >= 900) {
+        shouldBe("stuff", "" + i);
+        shouldBe("o.f", "" + (void 0));
+    } else
+        shouldBe("o.f", "" + i);
+}