Added command line debugger to D8 shell....

src/SConscript

 # Copyright 2008 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 55 matching lines @@
   'os:win32':   ['platform-win32.cc'],
   'mode:release': [],
   'mode:debug': [
     'objects-debug.cc', 'prettyprinter.cc', 'regexp-macro-assembler-tracer.cc'
   ]
 }
 
 
 D8_FILES = {
   'all': [
-    'd8.cc'
+    'd8.cc', 'd8-debug.cc'
   ],
   'console:readline': [
     'd8-readline.cc'
   ]
 }
 
 
 LIBRARY_FILES = '''
 runtime.js
 v8natives.js
@@ skipping 71 matching lines @@
     libraries_obj = context.ConfigureObject(env, libraries_empty_src, CPPPATH=['.'])
   else:
     snapshot_obj = empty_snapshot_obj
 
   library_objs = [non_snapshot_files, libraries_obj, snapshot_obj]
   return (library_objs, d8_objs)
 
 
 (library_objs, d8_objs) = ConfigureObjectFiles()
 Return('library_objs d8_objs')