Commits on Nov 7, 2021

1. Improve error when an .rlib can't be parsed …

   This usually describes either an error in the compiler itself or some
   sort of IO error. Either way, we should report it to the user rather
   than just saying "crate not found".
   
   This only gives an error if the crate couldn't be loaded at all - if the
   compiler finds another .rlib or .rmeta file which was valid, it will
   continue to compile the crate.
   
   Example output:
   ```
   error[E0785]: found invalid metadata files for crate `foo`
    --> bar.rs:3:24
     |
   3 |         println!("{}", foo::FOO_11_49[0]);
     |                        ^^^
     |
     = warning: failed to parse rlib '/home/joshua/test-rustdoc/libfoo.rlib': Invalid archive extended name offset
   ```

   

   jyn514 committed Nov 7, 2021
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