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Sometimes it can happen that invalid code like a TyKind::Error makes its way through the compiler without triggering any errors (this is always a bug in rustc but bugs do happen sometimes :)). These ICEs will manifest in the backend like as cg_llvm not being able to get the layout of `[type error]`, which makes it hard to debug. By flushing before codegen, we display all the delayed bugs, making it easier to trace it to the root of the problem.