Auto merge of #36601 - jseyfried:build_reduced_graph_in_expansion, r=nrc

Assign def ids and build the module graph during expansion

r? @nrc

diff --cc src/librustc_resolve/lib.rs
Simple merge

diff --cc src/libsyntax/ext/base.rs
Simple merge

diff --cc src/libsyntax/ext/expand.rs
Simple merge

diff --cc src/test/compile-fail/self_type_keyword.rs
Simple merge