Migrated several tests from blink to V8 repository.

test/webkit/dfg-check-two-structures.js

Index: test/webkit/dfg-check-two-structures.js
diff --git a/test/webkit/concat-while-having-a-bad-time.js b/test/webkit/dfg-check-two-structures.js
similarity index 72%
copy from test/webkit/concat-while-having-a-bad-time.js
copy to test/webkit/dfg-check-two-structures.js
index dfda1e08a0b36194b787a44ee12a9693acd8aeaf..b5881ff2d91fd7e56670245e1e59346131106a72 100644
--- a/test/webkit/concat-while-having-a-bad-time.js
+++ b/test/webkit/dfg-check-two-structures.js
@@ -22,10 +22,34 @@
 // 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 tests that a polymorphic structure check is actually executed."
 );
 
-Object.defineProperty(Array.prototype, 0, { writable: false });
-shouldBe("[42].concat()", "[42]");
+function foo(o, p) {
+    if (o == p)
+        return o.f;
+    else
+        return 75;
+}
 
+var o1 = {f:42, g:43};
+var o2 = {f:44};
+var o3 = {e:45, f:46};
 
+for (var i = 0; i < 200; ++i) {
+    var o;
+    var expected;
+    if (i < 150) {
+        if (i & 1) {
+            o = o1;
+            expected = 42;
+        } else {
+            o = o2;
+            expected = 44;
+        }
+    } else {
+        o = o3;
+        expected = 46;
+    }
+    shouldBe("foo(o, o)", "" + expected);
+}