Auto merge of #122371 - oli-obk:visit_nested_body, r=tmiasko

Stop walking the bodies of statics for reachability, and evaluate them instead

cc `@saethlin` `@RalfJung`

cc #119214

This reuses the `DefIdVisitor` from `rustc_privacy`, because they basically try to do the same thing.

This PR's changes can probably be extended to constants, too, but let's tackle that separately, it's likely more involved.
tree: 91895e6faf0242cc634ab7041171ae4b603052fc
  1. .github/
  2. .reuse/
  3. compiler/
  4. library/
  5. LICENSES/
  6. src/
  7. tests/
  8. .editorconfig
  9. .git-blame-ignore-revs
  10. .gitattributes
  11. .gitignore
  12. .gitmodules
  13. .mailmap
  14. Cargo.lock
  15. Cargo.toml
  16. CODE_OF_CONDUCT.md
  17. config.example.toml
  18. configure
  19. CONTRIBUTING.md
  20. COPYRIGHT
  21. INSTALL.md
  22. LICENSE-APACHE
  23. LICENSE-MIT
  24. README.md
  25. RELEASES.md
  26. rust-bors.toml
  27. rustfmt.toml
  28. triagebot.toml
  29. x
  30. x.ps1
  31. x.py
README.md

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