Auto merge of #53616 - varkor:hir-map-rename, r=nikomatsakis

Restructure hir::map::Node and hir::map::Entry

- Moves `hir::map::Node` to `hir::Node` and removes the `Node*` prefix from its variants.
- Changes `hir::map::Entry` to a struct `hir::map::Entry`.
- Removes the `Node*` prefix from each of `AnnNode`s variants.

r? @eddyb

diff --cc src/librustc_lint/builtin.rs
Simple merge