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* dwarf2dbg.c: Rewrite from scratch. Queue all debugging output
until dwarf2_finish; use relaxation to get cross-fragment offsets;
thread multiple subsegments properly; handle multiple code
sections properly; emit proper compilation unit info for assembler
generated debugging.
* as.h (enum _relax_state): Add rs_dwarf2dbg.
* dwarf2dbg.h (struct dwarf2_line_info): Remove filename.
(dwarf2dbg_estimate_size_before_relax): Declare.
(dwarf2dbg_relax_frag, dwarf2dbg_convert_frag): Declare.
* write.c: Include dwarf2dbg.h.
(cvt_frag_to_fill): Handle rs_dwarf2dbg.
(relax_segment): Likewise.