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Line Table Header variations.
The experimental version has a distinct version
number of 0xf006 so cannot be confused with DWARF4 or 5.
DWversion
2,3,4,5 meaning the DWARF standards
x meaning gcc's experimental two level line table.
2345x 1. unit_length (4 or 12 bytes)
2345x 2. version (2 bytes, for x is 0xF006)
5 2.1 address_size
5 2.2 segment_selector_size
2345x 3. header_length (4 or 8 bytes)
2345x 4. minimum_instruction_length (1 byte)
45 x 5. maximum_operations_per_instruction (1 byte)
2345x 6. default_is_stmt (1 byte)
2345x 7. line_base (1 byte)
2345x 8. line_range (1 byte)
2345x 9. opcode_base (1 byte)
2345x 10. standard_opcode_lengths (array of length opcode_base - 1)
234 x 11. include directories (for x just one NUL byte(empty list))
234 x 12. file_names (for x just one NUL byte(empty list))
x 13. fake_extended_op (5 bytes: 00 FF FF 7F 7F)
x 14. logicals_table_offset (4 or 8 bytes)
x 15. actuals_table_offset (4 or 8 bytes)
x5 16. directory_entry_format_count (1 byte)
x5 17. directory_entry_format (sequence of unsigned LEB128 pairs)
x5 18. directories_count (unsigned LEB128)
x5 19. directories (sequence of directory entries)
x5 20. file_name_entry_format_count (1 byte)
x5 21. file_name_entry_format (sequence of unsigned LEB128 pairs)
x5 22. file_names_count (unsigned LEB128)
x5 23. file_names (sequence of directory entries)
x 24. subprogram_entry_format_count (1 byte)
x 25. subprogram_entry_format (sequence of unsigned LEB128 pairs)
x 26. subprograms_count (unsigned LEB128)
x 27. subprograms (sequence of directory entries)
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