Rollup merge of #124655 - Darksonn:fixed-x18, r=lqd,estebank

Add `-Zfixed-x18`

This PR is a follow-up to #124323 that proposes a different implementation. Please read the description of that PR for motivation.

See the equivalent flag in [the clang docs](https://clang.llvm.org/docs/ClangCommandLineReference.html#cmdoption-clang-ffixed-x18).

MCP: https://github.com/rust-lang/compiler-team/issues/748
Fixes https://github.com/rust-lang/rust/issues/121970
r? rust-lang/compiler
tree: 2555a7a237461418a81135220388b2c22d3896f9
  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
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