Change the order of arguments of the (One|Two)ByteSeqStringSetChar intrinsic.

src/string.js

 // Copyright 2012 the V8 project authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 // This file relies on the fact that the following declaration has been made
 // in runtime.js:
 // var $String = global.String;
 
 // -------------------------------------------------------------------
 
@@ skipping 794 matching lines @@
     return %_StringCharFromCode(code & 0xffff);
   }
 
   var one_byte = %NewString(n, NEW_ONE_BYTE_STRING);
   var i;
   for (i = 0; i < n; i++) {
     var code = %_Arguments(i);
     if (!%_IsSmi(code)) code = ToNumber(code) & 0xffff;
     if (code < 0) code = code & 0xffff;
     if (code > 0xff) break;
-    %_OneByteSeqStringSetChar(one_byte, i, code);
+    %_OneByteSeqStringSetChar(i, code, one_byte);
   }
   if (i == n) return one_byte;
   one_byte = %TruncateString(one_byte, i);
 
   var two_byte = %NewString(n - i, NEW_TWO_BYTE_STRING);
   for (var j = 0; i < n; i++, j++) {
     var code = %_Arguments(i);
     if (!%_IsSmi(code)) code = ToNumber(code) & 0xffff;
-    %_TwoByteSeqStringSetChar(two_byte, j, code);
+    %_TwoByteSeqStringSetChar(j, code, two_byte);
   }
   return one_byte + two_byte;
 }
 
 
 // ES6 draft, revision 26 (2014-07-18), section B.2.3.2.1
 function HtmlEscape(str) {
   return TO_STRING_INLINE(str).replace(/"/g, "&quot;");
 }
 
@@ skipping 140 matching lines @@
     "fixed", StringFixed,
     "italics", StringItalics,
     "small", StringSmall,
     "strike", StringStrike,
     "sub", StringSub,
     "sup", StringSup
   ));
 }
 
 SetUpString();