[gold commit] PR gold/22776: Add support for DWARF-4 line number tables

[Cary Coutant]

Reads the maximum_operations_per_instruction field, added in DWARF-4 to the
line number program header.

Nick, this isn't a regression, but if LLVM is now generating DWARF-4
line number tables, I'm thinking it would be good to fix this on the
2.30 branch. OK with you? It's really quite trivial.

-cary


2018-02-02  Cary Coutant  <ccoutant@gmail.com>

gold/
        * PR gold/22776
        * dwarf_reader.cc (Sized_dwarf_line_info::read_header_prolog): Add
        support for DWARF-4 line number tables.
        * dwarf_reader.h (Sized_dwarf_line_info::max_ops_per_insn): New field.
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