Auto merge of #126993 - petrochenkov:atvisord3, r=BoxyUwU

ast: Standardize visiting order

Order: ID, attributes, inner nodes in source order if possible, tokens, span.

Also always use exhaustive matching in visiting infra, and visit some discovered missing nodes.

Unlike rust-lang/rust#125741 this shouldn't affect anything serious like `macro_rules` scopes.

Author: bors