Fix typo in assert.

test/mjsunit/string-split.js

Index: test/mjsunit/string-split.js
diff --git a/test/mjsunit/string-split.js b/test/mjsunit/string-split.js
index 9a5bb43f4a3b665d1c477d367dfa6b85808b3da5..bc509451355579c1074982396a6b8320c2b7befc 100644
--- a/test/mjsunit/string-split.js
+++ b/test/mjsunit/string-split.js
@@ -117,13 +117,14 @@ assertEquals(["a", "b", "c"], "abc".split("", numberObj(3)));
 assertEquals(["a", "b", "c"], "abc".split("", 4));
 assertEquals(["a", "b", "c"], "abc".split("", numberObj(4)));
 
-var all_ascii_chars = [];
-for (var i = 0; i < 128; i++) all_ascii_chars[i] = String.fromCharCode(i);
-var all_ascii_string = all_ascii_chars.join("");
+
+var all_ascii_codes = [];
+for (var i = 0; i < 128; i++) all_ascii_codes[i] = i;
+var all_ascii_string = String.fromCharCode.apply(String, all_ascii_codes);
 
 var split_chars = all_ascii_string.split("");
 assertEquals(128, split_chars.length);
 for (var i = 0; i < 128; i++) {
   assertEquals(1, split_chars[i].length);
   assertEquals(i, split_chars[i].charCodeAt(0));
-}
+}