saved_command_line, arcs_cmdline, command_line

[Justin Carlson <carlson@sibyte.com>]

I'm scanning over the command line arguments stuff, and noted a few things. 
Comments welcome.

Is there any reason saved_command_line is not architecture neutral?  Seems like
it should live in init/main.c, if anywhere.

Why do we have arcs_cmdline[] *AND* command_line[]?  Is there any respect in
which this isn't completely redundant?   (And misnamed, for that matter, for
non-arcs boards?)

-Justin