Fix input and output to handle UTF16 surrogate pairs.

src/preparser.h

 // Copyright 2012 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 47 matching lines @@
 namespace i = v8::internal;
 
 class DuplicateFinder {
  public:
   explicit DuplicateFinder(i::UnicodeCache* constants)
       : unicode_constants_(constants),
         backing_store_(16),
         map_(&Match) { }
 
   int AddAsciiSymbol(i::Vector<const char> key, int value);
-  int AddUC16Symbol(i::Vector<const uint16_t> key, int value);
+  int AddUtf16Symbol(i::Vector<const uint16_t> key, int value);
   // Add a a number literal by converting it (if necessary)
   // to the string that ToString(ToNumber(literal)) would generate.
   // and then adding that string with AddAsciiSymbol.
   // This string is the actual value used as key in an object literal,
   // and the one that must be different from the other keys.
   int AddNumber(i::Vector<const char> key, int value);
 
  private:
   int AddSymbol(i::Vector<const byte> key, bool is_ascii, int value);
   // Backs up the key and its length in the backing store.
@@ skipping 573 matching lines @@
   bool stack_overflow_;
   bool allow_lazy_;
   bool allow_modules_;
   bool allow_natives_syntax_;
   bool parenthesized_function_;
   bool harmony_scoping_;
 };
 } }  // v8::preparser
 
 #endif  // V8_PREPARSER_H