prog challenge [#12328]

Fork http://trac.webkit.org/wiki/JavaScriptCore

Disable JIT. Edit the interpreter so that it is limited to only use a very small fraction of the hosts CPU, and limited memory so that no webpage can cause any stability or speed problems to the host computer.

I needed 8GB memory with 2GB swap, an exra 12 GB HD to actually fit all the files webkit generates while compiling