Can Interpreter handle clone() call (with CLONE_VM flag)?

Dear all,
May I know whether Interpreter in llvm-2.6 can handle clone() call (with CLONE_VM flag)?
Another small question is: since JIT only invokes the main() function in a program once, and does not have control to the execution while main() is running, what is the benefit of using JIT?

The point of the JIT is that you can write a custom program which
JIT's and calls individual functions generated at runtime. lli itself
is more of an example program than a practical tool.