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[DWARFYAML][debug_abbrev] Make the abbreviation code optional.

Authored by Higuoxing on Jun 17 2020, 10:02 PM.

Description

[DWARFYAML][debug_abbrev] Make the abbreviation code optional.

This patch helps make the Code optional in abbreviations table.

Reviewed By: jhenderson

Differential Revision: https://reviews.llvm.org/D81826