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[DWARFYAML][debug_abbrev] Emit 0 byte for terminating abbreviations.

Authored by Higuoxing on Jul 1 2020, 8:17 AM.

Description

[DWARFYAML][debug_abbrev] Emit 0 byte for terminating abbreviations.

The abbreviations for a given compilation unit end with an entry
consisting of a 0 byte for the abbreviation code.

Reviewed By: jhenderson

Differential Revision: https://reviews.llvm.org/D82933