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[DWARFYAML] Make the ExtLen field of extended opcodes optional.

Authored by Higuoxing on Sep 23 2020, 11:11 PM.

Description

[DWARFYAML] Make the ExtLen field of extended opcodes optional.

This patch makes the 'ExtLen' field of extended opcodes optional. We
don't need to manually calculate it in the future.

Reviewed By: jhenderson, MaskRay

Differential Revision: https://reviews.llvm.org/D88136

Details