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(stack_info::init): Add extra arguments to control method of initialization.. If we have a known good frame, set things up so that this frame is not skipped the first time through. Record whether caller cares about arguments or not. (stack_info::walk): Don't store arguments if they're unwanted. (stackdump): Add isexception parameter for use when called by exception handler. (cygwin_stackdump): Accomodate extra argument to stackdump. (handle_exceptions): Ditto. (sig_handle): Ditto. (interrupt_on_return): Accomodate extra arguments to stack walk initialization.