Add parser support for generators.

src/scanner.cc

 // Copyright 2011 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 859 matching lines @@
   KEYWORD("true", Token::TRUE_LITERAL)                              \
   KEYWORD("try", Token::TRY)                                        \
   KEYWORD("typeof", Token::TYPEOF)                                  \
   KEYWORD_GROUP('v')                                                \
   KEYWORD("var", Token::VAR)                                        \
   KEYWORD("void", Token::VOID)                                      \
   KEYWORD_GROUP('w')                                                \
   KEYWORD("while", Token::WHILE)                                    \
   KEYWORD("with", Token::WITH)                                      \
   KEYWORD_GROUP('y')                                                \
-  KEYWORD("yield", Token::FUTURE_STRICT_RESERVED_WORD)
+  KEYWORD("yield", Token::YIELD)
 
 
 static Token::Value KeywordOrIdentifierToken(const char* input,
                                              int input_length,
                                              bool harmony_scoping,
                                              bool harmony_modules) {
   ASSERT(input_length >= 1);
   const int kMinLength = 2;
   const int kMaxLength = 10;
   if (input_length < kMinLength || input_length > kMaxLength) {
@@ skipping 189 matching lines @@
       Advance();
     }
   }
   literal.Complete();
 
   next_.location.end_pos = source_pos() - 1;
   return true;
 }
 
 } }  // namespace v8::internal