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rustc: Flag metadata compatible with multiple CGUs
It looks like the `OutputType::Metadata` kind in the compiler was misclassified in #38571 long ago by accident as incompatible with codegen units and a single output file. This means that if you emit both a linkable artifact and metadata it silently turns off multiple codegen units unintentionally! This commit corrects the situation to ensure that if `--emit metadata` is used it doesn't implicitly disable multiple codegen units. This will ensure we don't accidentally regress compiler performance when striving to implement pipelined compilation!
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