Migrated several tests from blink to V8 repository.

test/webkit/dfg-array-length-dead.js

Index: test/webkit/dfg-array-length-dead.js
diff --git a/test/webkit/concat-while-having-a-bad-time.js b/test/webkit/dfg-array-length-dead.js
similarity index 86%
copy from test/webkit/concat-while-having-a-bad-time.js
copy to test/webkit/dfg-array-length-dead.js
index dfda1e08a0b36194b787a44ee12a9693acd8aeaf..5256fe1ebac90fdcacf85ab5afac68422427c68a 100644
--- a/test/webkit/concat-while-having-a-bad-time.js
+++ b/test/webkit/dfg-array-length-dead.js
@@ -22,10 +22,15 @@
 // 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 an array length access being dead does not result in register allocation failures."
 );
 
-Object.defineProperty(Array.prototype, 0, { writable: false });
-shouldBe("[42].concat()", "[42]");
+function foo(x) {
+    var y = x.f.length;
+    return 42;
+}
 
+for (var i = 0; i < 1000; ++i) {
+    shouldBe("foo({f:[]})", "42");
+}