Get the name/offset of the calling wasm function

When in a host function called from a wasm module, m3_GetBacktrace(runtime) returns a valid IM3BacktraceInfo but its fields (frames, lastFrame) are always NULL.

I'd like to use the backtrace to get the name/offset of the calling wasm function.

I have d_m3RecordBacktraces set to 1 in m_config.h.