Migrated several tests from blink to V8 repository.

test/webkit/dfg-to-string-on-value.js

Index: test/webkit/dfg-to-string-on-value.js
diff --git a/test/webkit/concat-while-having-a-bad-time.js b/test/webkit/dfg-to-string-on-value.js
similarity index 85%
copy from test/webkit/concat-while-having-a-bad-time.js
copy to test/webkit/dfg-to-string-on-value.js
index dfda1e08a0b36194b787a44ee12a9693acd8aeaf..0c89f3b89c18e96edde4a9a2a8c9d20030eabc62 100644
--- a/test/webkit/concat-while-having-a-bad-time.js
+++ b/test/webkit/dfg-to-string-on-value.js
@@ -21,11 +21,12 @@
 // (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
 // 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."
-);
+description("Tests that ToString on a possible-non-cell value works.");
 
-Object.defineProperty(Array.prototype, 0, { writable: false });
-shouldBe("[42].concat()", "[42]");
+function foo(a, o) {
+    return [a, String(o)];
+}
 
+for (var i = 0; i < 100; ++i)
+    shouldBe("\"\" + foo(\"foo\", i % 2 ? \"hello\" : 42)", i % 2 ? "\"foo,hello\"" : "\"foo,42\"");