Oleksandr Tymoshenko 4e6df32763 - Use PC/RA/SP values as arguments for stacktrace_subr instead of trapframe.
Context info could be obtained from other sources (see below) no only from
    td_pcb field
- Do not show a0..a3 values unless they're obtained from the stack. These
    are only confirmed values.
- Fix bt command in DDB. Previous implementation used thread's trapframe
    structure as a source info for trace unwinding, but this structure
    is filled only when exception occurs. Valid register values for sleeping
    processes are in pcb_context array. For curthread use pc/sp/ra for current
    frame
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