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[Debugify] Expose original debug info preservation check as CC1 option

Authored by djtodoro on Mar 11 2021, 6:55 AM.

Description

[Debugify] Expose original debug info preservation check as CC1 option

In order to test the preservation of the original Debug Info metadata
in your projects, a front end option could be very useful, since users
usually report that a concrete entity (e.g. variable x, or function fn2())
is missing debug info. The [0] is an example of running the utility
on GDB Project.

This depends on: D82546 and D82545.

Differential Revision: https://reviews.llvm.org/D82547