lldb has enough support to do kernel coredump debugging. lldb multiple
scripting interfaces, most notably in python and lua. The lua interface is less
mature than the python interface, but it is small enough that we are able to
distribute it in the base lldb.
Implement some helper functions for use from lua and offer an explanation of
the lua interface.
This is a first attempt, I'm not supre confident that this is good lua or the
best use of the lldb api. There is a shortage of documentation for this
interface, but I've managed ok from adapting the generated python bindings.