Move the libunw_step call from unw_step_real to unw_step, to disentagle from copying the cursor and return address validation.
Move the libunw_step call from unw_step_real to unw_step, to disentagle
from copying the cursor and return address validation.

HPCToolkit/hpctoolkit,HPCToolkit/hpctoolkit,HPCToolkit/hpctoolkit,HPCToolkit/hpctoolkit,HPCToolkit/hpctoolkit,HPCToolkit/hpctoolkit