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[DebugInfo] Add use of truncating data extractor to debug line parsing

Authored by jhenderson on May 20 2020, 7:53 AM.

Description

[DebugInfo] Add use of truncating data extractor to debug line parsing

This will ensure that nothing can ever start parsing data from a future
sequence and part-read data will be returned as 0 instead.

Reviewed by: aprantl, labath

Differential Revision: https://reviews.llvm.org/D80796