Import intl test suite from v8-i18n project

test/intl/overrides/caching.js

 // Copyright 2013 the V8 project authors. All rights reserved.
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 // modification, are permitted provided that the following conditions are
 // met:
 //
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 //       from this software without specific prior written permission.
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 // "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
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 // LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
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 // 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.
 
-// Create a regexp in the form of a?a?...a? so that fully
-// traversing the entire graph would be prohibitively expensive.
-// This should not cause time out.
-var r1 = "";
+// Performance test for overriden methods. Makes sure that default case
+// is faster (cached) than the general case.
+
+// Default, cached.
+var startTime = new Date();
 for (var i = 0; i < 1000; i++) {
-  r1 += "a?";
+  'a'.localeCompare('c');
 }
-"test".match(RegExp(r1));
+var endTime = new Date();
+var cachedTime = endTime.getTime() - startTime.getTime();
 
-var r2 = "";
-for (var i = 0; i < 100; i++) {
-  r2 += "(a?|b?|c?|d?|e?|f?|g?)";
+// Not cached.
+startTime = new Date();
+for (var i = 0; i < 1000; i++) {
+  'a'.localeCompare('c', 'sr');
 }
-"test".match(RegExp(r2));
+endTime = new Date();
+var nonCachedTime = endTime.getTime() - startTime.getTime();
 
-// Create a regexp in the form of ((..(a)a..)a.
-// Compiling it causes EatsAtLeast to reach the maximum
-// recursion depth possible with a given budget.
-// This should not cause a stack overflow.
-var r3 = "a";
+// Using collator. Faster than default, but not by much.
+var collator = Intl.Collator();
+startTime = new Date();
 for (var i = 0; i < 1000; i++) {
-  r3 = "(" + r3 + ")a";
+  collator.compare('a', 'c');
 }
-"test".match(RegExp(r3));
+endTime = new Date();
+collatorTime = endTime.getTime() - startTime.getTime();
 
+// Difference is within 20%.
+assertTrue(collatorTime < cachedTime);
+// Non-cached time is much slower, measured to 12.5 times.
+assertTrue(cachedTime < nonCachedTime);
+