Summary:
Each sequence of tuples within an entires set is terminated with (0,
0) according to the DWARF standard (see 7.20 in
http://www.dwarfstd.org/doc/DWARF4.pdf).

Reviewed By: ot, luciang

Differential Revision: D4014952

fbshipit-source-id: c4b034c94adc4a0d9b052456c02919a54a79eaf1