fix duplicated leaf frame for dwarf unwinding #2811
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We already record the leaf frame in
set_initial_state, so we don't need to record it again during the main unwinding loop.The FP unwinder handles this by recording the frame that was reached in each iteration of the loop, whereas the DWARF unwinder records the frame from the previous iteration of the loop. This PR changes the DWARF unwinder to match the behavior of the FP unwinder, fixing the issue.
FYI @metalmatze