Commits on Apr 25, 2019

1. rustc: Flag metadata compatible with multiple CGUs …

   It looks like the `OutputType::Metadata` kind in the compiler was
   misclassified in rust-lang#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!

   

   alexcrichton committed Apr 25, 2019
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