Optimize non-ASCII string splitting with single-character search pattern

test/mjsunit/string-split.js

 // Copyright 2008 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 48 matching lines @@
 assertArrayEquals(["a","","b"], "axxb".split(/x/));
 
 // This was http://b/issue?id=1151354
 assertArrayEquals(["div", "#id", ".class"], "div#id.class".split(/(?=[#.])/));
 
 
 assertArrayEquals(["div", "#i", "d", ".class"], "div#id.class".split(/(?=[d#.])/));
 
 assertArrayEquals(["a", "b", "c"], "abc".split(/(?=.)/));
 
+assertArrayEquals(["Wenige", "sind", "auserwählt."],
+                  "Wenige sind auserwählt.".split(" "));
+
+assertArrayEquals([], "Wenige sind auserwählt.".split(" ", 0));
+
+assertArrayEquals(["Wenige"], "Wenige sind auserwählt.".split(" ", 1));
+
+assertArrayEquals(["Wenige", "sind"], "Wenige sind auserwählt.".split(" ", 2));
+
+assertArrayEquals(["Wenige", "sind", "auserwählt."],
+                  "Wenige sind auserwählt.".split(" ", 3));
+
+assertArrayEquals(["Wenige sind auserw", "hlt."],
+                  "Wenige sind auserwählt.".split("ä"));
+
+assertArrayEquals(["Wenige sind ", "."],
+                  "Wenige sind auserwählt.".split("auserwählt"));
 
 /* "ab".split(/((?=.))/)
  *
  * KJS:   ,a,,b
  * SM:    a,,b,
  * IE:    a,b
  * Opera: a,,b
  * V8:    a,,b
  *
  * Opera seems to have this right.  The others make no sense.
@@ skipping 42 matching lines @@
 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));
 }