Add duplicate parameter detection to preparser.

src/preparser-api.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 14 matching lines @@
 // (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
 // OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 
 #include "../include/v8-preparser.h"
 
 #include "globals.h"
 #include "checks.h"
 #include "allocation.h"
 #include "utils.h"
 #include "list.h"
+#include "hashmap.h"
 #include "scanner-base.h"
 #include "preparse-data-format.h"
 #include "preparse-data.h"
 #include "preparser.h"
 
 namespace v8 {
 namespace internal {
 
 // UTF16Buffer based on a v8::UnicodeInputStream.
 class InputStreamUTF16Buffer : public UC16CharacterStream {
@@ skipping 166 matching lines @@
   return PreParserData(size, data);
 }
 
 }  // namespace v8.
 
 
 // Used by ASSERT macros and other immediate exits.
 extern "C" void V8_Fatal(const char* file, int line, const char* format, ...) {
   exit(EXIT_FAILURE);
 }