rustc-ap-rustc_cratesio_shim 504.0.0

Automatically published version of the package `rustc_cratesio_shim` in the rust-lang/rust repository from commit 9d5b6efdf62dbcd7bdf8e78a5f69c1b6678fd155 The publishing script for this crate lives at: https://github.com/alexcrichton/rustc-auto-publish