Migrated several tests from blink to V8 repository.

test/webkit/dfg-arguments-alias-one-block-overwrite.js

Index: test/webkit/dfg-arguments-alias-one-block-overwrite.js
diff --git a/test/webkit/concat-while-having-a-bad-time.js b/test/webkit/dfg-arguments-alias-one-block-overwrite.js
similarity index 76%
copy from test/webkit/concat-while-having-a-bad-time.js
copy to test/webkit/dfg-arguments-alias-one-block-overwrite.js
index dfda1e08a0b36194b787a44ee12a9693acd8aeaf..e94ad8b0112d4628d058d0579b2307ad8782fac3 100644
--- a/test/webkit/concat-while-having-a-bad-time.js
+++ b/test/webkit/dfg-arguments-alias-one-block-overwrite.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 if you alias the arguments in a very small function, arguments simplification still works even if the variable isn't must-aliased."
 );
 
-Object.defineProperty(Array.prototype, 0, { writable: false });
-shouldBe("[42].concat()", "[42]");
+function foo() {
+    var args = arguments;
+    args = [1, 2, 3];
+    return args[0] + args[1] + args[2];
+}
 
+var result = "";
+for (var i = 0; i < 300; ++i) {
+    var a;
+    if (i < 200)
+        a = i;
+    else
+        a = "hello";
+    var b = i + 1;
+    var c = i + 3;
+    shouldBe("foo(a, b, c)", "6");
+}