Rollup merge of #68889 - Zoxc:hir-krate, r=eddyb

Move the `hir().krate()` method to a query and remove the `Krate` dep node

r? @eddyb cc @michaelwoerister

diff --cc src/librustc/query/mod.rs
Simple merge

diff --cc src/librustc_typeck/check/mod.rs
Simple merge

diff --cc src/librustdoc/test.rs
Simple merge