Import intl test suite from v8-i18n project

test/intl/date-format/wellformed-unsupported-locale.js

Index: test/intl/date-format/wellformed-unsupported-locale.js
diff --git a/test/mjsunit/regress/regress-2624.js b/test/intl/date-format/wellformed-unsupported-locale.js
similarity index 88%
copy from test/mjsunit/regress/regress-2624.js
copy to test/intl/date-format/wellformed-unsupported-locale.js
index 2bfd7b2585016cda6db68fbac10d4a395e7ece09..5662fd3c37dec38afaaf42babcaf65a9a74c1782 100644
--- a/test/mjsunit/regress/regress-2624.js
+++ b/test/intl/date-format/wellformed-unsupported-locale.js
@@ -24,13 +24,10 @@
 // THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
 // (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
 // OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+// limitations under the License.
 
-// Flags: --print-code
+// Passing a well formed but unsupported locale falls back to default.
 
-var source = '"snowmen invasion " + "';
-for(var i = 0; i < 800; i++) {
-  source += '\u2603';
-}
-source += '"';
-eval(source);
+var dtf = Intl.DateTimeFormat(['xx']);
 
+assertEquals(dtf.resolvedOptions().locale, getDefaultLocale());