Cannot emit `metadata,obj` without `link`

[ojeda]

Requesting both metadata and obj without link fails:

$ echo | rustc --crate-type rlib --emit=metadata,obj -

The output files are created, but the compiler thinks it still has to build the archive:

error: failed to build archive: No such file or directory

The same behavior happens for other metadata + non-link combinations.

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Both latest stable (1.49.0) and nightly exhibit the problem.