[PATCH] libdw: Break long or circular DIE ref chains in dwarf_[has]attr_integrate.

[Mark Wielaard]

On Sun, 2018-06-10 at 17:01 +0200, Mark Wielaard wrote:
> Bad DWARF could create a very long or circular DIE ref chain by linking
> DW_AT_abstract_origin or DW_AT_specification to the DIE itself. Break
> the chain after seeing a large number (16) of DIEs.

Pushed to master.