Auto merge of #37793 - jseyfried:fix_proc_macro_def_ids, r=nrc

Fix proc macro def ids

Update some `CStore` methods to also work correctly with proc macro def ids.
Fixes #37788.
r? @nrc

diff --cc src/librustc_metadata/cstore_impl.rs
Simple merge

diff --cc src/librustc_metadata/decoder.rs
Simple merge