C++: Provide `BarrierGuard` API without a `Unit` column when instantiating non-parameterized `BarrierGuard`s#21360

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MathiasVP merged 3 commits intogithub:mainfrom

microsoft:unbreak-changes

Feb 24, 2026

Commits on Feb 24, 2026

C++: Provide barrier node API without the unit column when instantiating non-parameterized barrier guards.
MathiasVP
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C++: Add change note.
MathiasVP
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C++: Make a test slightly more verbose to catch this issue in the future.
MathiasVP
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