Commits on Jul 15, 2021

1. Reuse CrateNum for proc-macro crates even when cross-compiling …

   Proc-macros are always compiled for the host, so this should be the same
   in every way as recompiling the crate.
   
   I am not sure why the previous code special-cased the target, since the
   compiler properly gives an error when trying to load a crate for a
   different host:
   
   ```
   error[E0461]: couldn't find crate `dependency` with expected target triple x86_64-unknown-linux-gnu
     --> /home/joshua/rustc4/src/test/ui/cfg-dependent.rs:8:2
      |
   LL |     dependency::is_64();
      |     ^^^^^^^^^^
      |
      = note: the following crate versions were found:
              crate `dependency`, target triple i686-unknown-linux-gnu: /home/joshua/rustc4/build/x86_64-unknown-linux-gnu/test/ui/cfg-dependent/auxiliary/libdependency.so
   ```
   
   I think another possible fix is to remove the check altogether. But I'm
   not sure, and this fix works, so I'm not making the larger change here.

   

   jyn514 committed Jul 15, 2021
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