-v and -vv

[Matthew Fluet]

> > I  didn't see the assembler ever being called in the -v output.  Clearly that
> > should be fixed up.  
> 
> There are calls to gcc which call the assembler.  I remember trying to switch
> those to calls to "as" at some point, but it didn't work (I don't remember why)
> so I switched it back.

Right now they won't work as calls to "as" because the __LINE__ directive
needs to be processed by cpp.  Also, at one point in time, there was a
difference between the character constants for cpp and for "as", but I
think that now I convert all character constants to their ordinal values.