Stores information about a thread's stack.
Note, on the emulator, the memory between iLimit and the thread's current stack pointer may not actually be committed.
See also: RThread::StackInfo()
The address which the stack pointer would contain if the stack were empty.
The limit value for the stack if it were expanded to its maximum size.
Currently expanding stacks is not supported so iExpandLimit==iLimit
The address which the stack pointer would contain if the stack were full, (The lowest valid address).