[PATCH] Add -### option

[Robert Lipe]

Graham >Why the wierd name for the new option?

Ira> (b) It was suggested by someone here (because I couldn't think of
Ira> anything appropriate either) as an option that did a similar thing
Ira> on Sun systems.

I know it's not much of a justification, but several System V vendor
compilers support that.  From 'man cc':

  -#, -i  Turn on driver debugging. Print out each command with its options
          and arguments as invoked by cc before the command is executed.

  -##, -ii
          Print out the full pathname of each command, in addition to the
          command, its options and arguments as invoked by cc before the
          command is executed.

  -###, -iii
          The same as -##, except that the command is not executed.