[toplevel bootstrap PATCH] Add profiledbootstrap

[Nathanael Nerode]

Paolo Bonzini wrote:
> This patch adds toplevel profiledbootstrap.
> 
> Since this makes stage1 have multiple descendants, I had to abandon
> the prev/next scheme to link bootstrap-stages.
> 
> Instead, I either specify dependancies separately or  use double-colon
> rules, 
The top level isn't allowed to use GNU make, IIRC -- aren't double-colon 
rules a GNU makeism?  :-P  Or are they portable?

(And isn't this a nightmare?  Thanks for your work.)