TimNN added a comment. This also broke Rust when compiled at LLVM head: https://buildkite.com/llvm-project/rust-llvm-integrate-prototype/builds/13166#0182fb4a-0f2d-4f2e-830f-f62b463b8d48. (I don't know whether this was some existing UB that got only exposed by this patch or not, but wanted to make you aware. Reproduces with 2+ codegen units and a 1+ optimization level).
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