Verfication of context-switching mechanism for protected stacks

[Utkarsh Rai]

The following patch provides a context-switching mechanism for protected
stacks. This is not a mergeable patch. I want to have feedback on the
mechanism.
> I have added 'stack_attribute' to the 'Context_Control' structure.
> On a call to 'Context_Initialize()'. the 'stack_attribute' field is
initialized with attributes of the current thread.
> On each context-switch we branch to the 'prot_stack_context_switch()'
which unsets the memory attributes of the currently executing thread-stack.
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