Add filename completion to d8's bash completion.

tools/bash-completion.sh

 #!/bin/bash
 # 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
@@ skipping 30 matching lines @@
     | grep "^DEFINE" \
     | grep -v "DEFINE_implication" \
     | sed -e 's/_/-/g')
   targets=$(echo "$defines" \
     | sed -ne 's/^DEFINE-[^(]*(\([^,]*\).*/--\1/p'; \
     echo "$defines" \
     | sed -ne 's/^DEFINE-bool(\([^,]*\).*/--no\1/p'; \
     cat src/d8.cc \
     | grep "strcmp(argv\[i\]" \
     | sed -ne 's/^[^"]*"--\([^"]*\)".*/--\1/p')
-  COMPREPLY=($(compgen -W "$targets" -- "$cur"))
+  COMPREPLY=($(compgen -W "$targets" -- "$cur") $(compgen -f -- "$cur"))
   return 0
 }
 
 complete -F _v8_flag d8