Reintroduce duplicate identifier detection in preparser.

src/SConscript

 # 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 204 matching lines @@
   'simulator:arm': ['arm/simulator-arm.cc'],
   'simulator:mips': ['mips/simulator-mips.cc'],
   'os:freebsd': ['platform-freebsd.cc', 'platform-posix.cc'],
   'os:openbsd': ['platform-openbsd.cc', 'platform-posix.cc'],
   'os:linux':   ['platform-linux.cc', 'platform-posix.cc'],
   'os:android': ['platform-linux.cc', 'platform-posix.cc'],
   'os:macos':   ['platform-macos.cc', 'platform-posix.cc'],
   'os:solaris': ['platform-solaris.cc', 'platform-posix.cc'],
   'os:cygwin':  ['platform-cygwin.cc', 'platform-posix.cc'],
   'os:nullos':  ['platform-nullos.cc'],
-  'os:win32':   ['platform-win32.cc'],
+  'os:win32':   ['platform-win32.cc', 'win32-math.cc'],
   'mode:release': [],
   'mode:debug': [
     'objects-debug.cc', 'prettyprinter.cc', 'regexp-macro-assembler-tracer.cc'
   ]
 }
 
 
 PREPARSER_SOURCES = {
   'all': Split("""
     allocation.cc
+    bignum.cc
+    bignum-dtoa.cc
+    cached-powers.cc
+    conversions.cc
+    diy-fp.cc
+    dtoa.cc
+    fast-dtoa.cc
+    fixed-dtoa.cc
     hashmap.cc
     preparse-data.cc
     preparser.cc
     preparser-api.cc
     scanner-base.cc
+    strtod.cc
     token.cc
     unicode.cc
     utils.cc
-    """)
+    """),
+  'os:win32': ['win32-math.cc']
 }
 
 
 D8_LIGHT_FILES = {
   'all': [
     'd8.cc'
   ]
 }
 
 
@@ skipping 129 matching lines @@
       snapshot_cc = 'snapshot.cc'
     snapshot_obj = context.ConfigureObject(env, snapshot_cc, CPPPATH=['.'])
   else:
     snapshot_obj = empty_snapshot_obj
   library_objs = [non_snapshot_files, libraries_obj, experimental_libraries_obj, snapshot_obj]
   return (library_objs, d8_objs, [mksnapshot], preparser_objs)
 
 
 (library_objs, d8_objs, mksnapshot, preparser_objs) = ConfigureObjectFiles()
 Return('library_objs d8_objs mksnapshot preparser_objs')