Migrated several tests from blink to V8 repository.

test/webkit/dfg-dead-speculation.js

Index: test/webkit/dfg-dead-speculation.js
diff --git a/test/webkit/concat-while-having-a-bad-time.js b/test/webkit/dfg-dead-speculation.js
similarity index 77%
copy from test/webkit/concat-while-having-a-bad-time.js
copy to test/webkit/dfg-dead-speculation.js
index dfda1e08a0b36194b787a44ee12a9693acd8aeaf..7778f5a48ef06881c7b726a36a0f4e13884170a1 100644
--- a/test/webkit/concat-while-having-a-bad-time.js
+++ b/test/webkit/dfg-dead-speculation.js
@@ -22,10 +22,24 @@
 // 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 will still perform speculations on dead things."
 );
 
-Object.defineProperty(Array.prototype, 0, { writable: false });
-shouldBe("[42].concat()", "[42]");
+function foo(a, b) {
+    var x = a.f - b;
+    return 10;
+}
 
+var thingy = {f:42};
+var variable = 84;
+var expected = 84;
+
+for (var i = 0; i < 200; ++i) {
+    if (i == 150) {
+        thingy = {f:{valueOf:function(){ variable = 24; return 5; }}};
+        expected = 24;
+    }
+    shouldBe("foo(thingy, i)", "10");
+    shouldBe("variable", "" + expected);
+}