Migrated several tests from blink to V8 repository.

test/webkit/dfg-holy-put-by-val-interferes-with-get-array-length.js

Index: test/webkit/dfg-holy-put-by-val-interferes-with-get-array-length.js
diff --git a/test/webkit/concat-while-having-a-bad-time.js b/test/webkit/dfg-holy-put-by-val-interferes-with-get-array-length.js
similarity index 84%
copy from test/webkit/concat-while-having-a-bad-time.js
copy to test/webkit/dfg-holy-put-by-val-interferes-with-get-array-length.js
index dfda1e08a0b36194b787a44ee12a9693acd8aeaf..684ebe81947c7f06b1f10b275bebe87f9b58c0e3 100644
--- a/test/webkit/concat-while-having-a-bad-time.js
+++ b/test/webkit/dfg-holy-put-by-val-interferes-with-get-array-length.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 the DFG's interference analysis knows that a holy PutByVal interferes with a GetArrayLength."
 );
 
-Object.defineProperty(Array.prototype, 0, { writable: false });
-shouldBe("[42].concat()", "[42]");
+function foo(array) {
+    var x = array.length;
+    array[1] = 42;
+    return [x, array.length];
+}
+
+for (var i = 0; i < 100; ++i)
+    shouldBe("foo([75])", "[1,2]");