Migrated several tests from blink to V8 repository.

test/webkit/dfg-to-string-int-or-string.js

Index: test/webkit/dfg-to-string-int-or-string.js
diff --git a/test/webkit/concat-while-having-a-bad-time.js b/test/webkit/dfg-to-string-int-or-string.js
similarity index 82%
copy from test/webkit/concat-while-having-a-bad-time.js
copy to test/webkit/dfg-to-string-int-or-string.js
index dfda1e08a0b36194b787a44ee12a9693acd8aeaf..54fabd0cf77c8440bac51b8701c719627a768a2f 100644
--- a/test/webkit/concat-while-having-a-bad-time.js
+++ b/test/webkit/dfg-to-string-int-or-string.js
@@ -22,10 +22,14 @@
 // 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 we do ToString conversions correctly when String.prototype.valueOf is not what we wanted."
 );
 
-Object.defineProperty(Array.prototype, 0, { writable: false });
-shouldBe("[42].concat()", "[42]");
-
+function foo(a) {
+    for (var i = 0; i < 100; ++i)
+        a = new String(a);
+    return a;
+}
 
+for (var i = 0; i < 1000; ++i)
+    shouldBe("\"\" + foo(i % 2 ? 42 : \"hello\")", "i % 2 ? \"42\" : \"hello\"");