Auto merge of #62684 - petrochenkov:scopevisit, r=davidtwco

resolve: Improve candidate search for unresolved macro suggestions

Use same scope visiting machinery for both collecting suggestion candidates and actually resolving the names.

The PR is better read in per-commit fashion with whitespace changes ignored (the first commit in particular moves some code around).

This should be the last pre-requisite for https://github.com/rust-lang/rust/pull/62086.
r? @davidtwco

diff --cc src/libsyntax_pos/symbol.rs
Simple merge