Cleanup code and make it explicitly work with the unw_backtrace api.
Cleanup code and make it explicitly work with the unw_backtrace api.

muojp/heaptrack,muojp/heaptrack,stormspirit/heaptrack,muojp/heaptrack,muojp/heaptrack,stormspirit/heaptrack,stormspirit/heaptrack,muojp/heaptrack