Doesn't run
~~~~~~~~~~~
Anything with the __NR_clone system call.  No idea what to do about
threads yet.

netscape bombs shortly after successful normal startup.
(???)


ToDo
~~~~
Rewrite memory manager, with variable sized red zones.


Desirable
~~~~~~~~~
Demangle C++ names.

Stack: make return address into NoAccess ?

Give client programs a way to set memory range permissions.

Have an --allow-scummy-symbols option, to allow in some of the symbols
currently ignored in vg_symtab2.c.

Figure out whether cwq (convert signed-32 to signed-64) as
translated into ucode gives correct check semantics.
(I think it does.)

Check __NR_select; I don't really understand it.
For that matter, __NR_newselect looks wrong too.