Fix raw TemplateLiteral spans with non-ascii characters

test/mjsunit/harmony/templates.js

 // Copyright 2014 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.
 
 // Flags: --harmony-templates
 
 var num = 5;
 var str = "str";
 function fn() { return "result"; }
 var obj = {
@@ skipping 383 matching lines @@
 
   callSites = [];
 
   tag`\uc548\ub155`;
   tag`안녕`;
   assertEquals(2, callSites.length);
   assertTrue(callSites[0] !== callSites[1]);
   assertEquals("안녕", callSites[0][0]);
   assertEquals("\\uc548\\ub155", callSites[0].raw[0]);
   assertEquals("안녕", callSites[1][0]);
-  // TODO(caitp, arv): blocked on correctly generating raw strings from
-  // multi-byte UTF8.
-  // assertEquals("안녕", callSites[1].raw[0]);
+  assertEquals("안녕", callSites[1].raw[0]);

[mathias, 2014/11/25 14:45:00]

May want to test UTF-8 encoded symbols that take up 3 or 4 bytes as well.
Example string that contains all of these (from
https://mathiasbynens.be/notes/javascript-unicode#poo-test):

    "Iñtërnâtiônàlizætiøn☃💩"

[caitp (gmail), 2014/11/26 14:12:01]

It's not necessarily guaranteed that there is any decoding from utf8 involved
--- but I guess it doesn't hurt to add a more thorough unicode test case. Done
and done!

 })();
 
 
 (function testExtendedArrayPrototype() {
   Object.defineProperty(Array.prototype, 0, {
     set: function() {
       assertUnreachable();
     }
   });
   function tag(){}
   tag`a${1}b`;
 })();