phosek added a comment. It looks like the `BarrierNoop` pass is inserted under `-O0` when any extension is registered <https://github.com/llvm/llvm-project/blob/749702fc6ba268cb0096c09393db51a20bb5eb0d/llvm/lib/Transforms/IPO/PassManagerBuilder.cpp#L558>. We enable Polly in our toolchain so that's likely the reason why we're seeing this on our bots.
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