Extend test coverage for JSON.stringify's slow path.

test/mjsunit/regress/regress-latin-1.js

 // Copyright 2013 the V8 project authors. All rights reserved.
 // Redistribution and use in source and binary forms, with or without
 // modification, are permitted provided that the following conditions are
 // met:
 //
 //     * Redistributions of source code must retain the above copyright
 //       notice, this list of conditions and the following disclaimer.
 //     * Redistributions in binary form must reproduce the above
 //       copyright notice, this list of conditions and the following
 //       disclaimer in the documentation and/or other materials provided
@@ skipping 11 matching lines @@
 // LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
 // DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
 // 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.
 
 assertEquals(String.fromCharCode(97, 220, 256), 'a' + '\u00DC' + '\u0100');
 assertEquals(String.fromCharCode(97, 220, 256), 'a\u00DC\u0100');
 
 assertEquals(0x80, JSON.stringify("\x80").charCodeAt(1));
+assertEquals(0x80, JSON.stringify("\x80", 0, null).charCodeAt(1));
 
 assertEquals(['a', 'b', '\xdc'], ['b', '\xdc', 'a'].sort());
 
 assertEquals(['\xfc\xdc', '\xfc'], new RegExp('(\xdc)\\1', 'i').exec('\xfc\xdc'));
 // Same test but for all values in Latin-1 range.
 var total_lo = 0;
 for (var i = 0; i < 0xff; i++) {
   var base = String.fromCharCode(i);
   var escaped = base;
   if (base == '(' || base == ')' || base == '*' || base == '+' ||
@@ skipping 39 matching lines @@
 for (var testNumber = 0; testNumber < 2; testNumber++) {
   var testString = "\xdc";
   var loopLength = testNumber == 0 ? 0 : 20;
   for (var i = 0; i < loopLength; i++ ) {
     testString += testString;
   }
   var stringified = JSON.stringify({"test" : testString}, null, 0);
   var stringifiedExpected = '{"test":"' + testString + '"}';
   assertEquals(stringifiedExpected, stringified);
 }