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[IROutliner] Adding OptRemarks to the IROutliner Pass

Authored by AndrewLitteken on Aug 24 2020, 2:21 AM.

Description

[IROutliner] Adding OptRemarks to the IROutliner Pass

This prints OptRemarks at each location where a decision is made to not
outline, or to outline a specific section for the IROutliner pass.

Test:
llvm/test/Transforms/IROutliner/opt-remarks.ll

Reviewers: jroelofs, paquette

Differential Revision: https://reviews.llvm.org/D87300