Rollup merge of #154322 - m4rch3n1ng:hash-map-macro, r=Mark-Simulacrum

feat: reimplement `hash_map!` macro

originally implemented in rust-lang/rust#144070, this had to be reverted in rust-lang/rust#148049 due to name ambiguity, as the macro was automatically put into the prelude. now, that rust-lang/rust#139493 has landed, it is possible to have a top-level macro, that is not exported by default, which should make it possible to reland this again.

implements rust-lang/rust#144032
implementation from rust-lang/rust#144070, original author has been added as co-author
effectively reverts rust-lang/rust#148049
tree: 111a2cee810bf2859d3fc9c0ee805321e6cd3f45
  1. .github/
  2. compiler/
  3. library/
  4. LICENSES/
  5. src/
  6. tests/
  7. .clang-format
  8. .editorconfig
  9. .git-blame-ignore-revs
  10. .gitattributes
  11. .gitignore
  12. .gitmodules
  13. .ignore
  14. .mailmap
  15. bootstrap.example.toml
  16. Cargo.lock
  17. Cargo.toml
  18. CODE_OF_CONDUCT.md
  19. configure
  20. CONTRIBUTING.md
  21. COPYRIGHT
  22. INSTALL.md
  23. LICENSE-APACHE
  24. license-metadata.json
  25. LICENSE-MIT
  26. package.json
  27. README.md
  28. RELEASES.md
  29. REUSE.toml
  30. rust-bors.toml
  31. rustfmt.toml
  32. triagebot.toml
  33. typos.toml
  34. x
  35. x.ps1
  36. x.py
  37. yarn.lock
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