[Issue 20510] Make backtrace code read the dSYM data

[d-bugmail at puremagic.com]

https://issues.dlang.org/show_bug.cgi?id=20510

--- Comment #1 from Mathias LANG <pro.mathias.lang at gmail.com> ---
For reference, more informations about the scheme can be found here:
http://wiki.dwarfstd.org/index.php?title=Apple%27s_%22Lazy%22_DWARF_Scheme

The same person has written a SO answer here:
https://stackoverflow.com/a/12827463

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