[Sim] New sim/common/cgen.sh

[Doug Evans]

Ben Elliston writes:
 >     > I have also just fixed genmloop.sh so that it has an -outfile-suffix option.
 >     > This allows the generated files to form unique filenames -- so it, too, can
 >     > be run by a parallel make.
 > 
 >    Can't this problem be solved without adding an option?
 > 
 > Can you suggest how?

The theory is that the script is already being passed something it can use.

There's the -cpu argument.  I dunno if your @prefix@ patches change whether
genmloop.sh should use @cpu@ or @prefix@, but won't one of them
(whichever it is) be sufficient to separate the output files?