Rollup merge of #124090 - durin42:llvm-19-riscv-feature, r=cuviper

llvm: update riscv target feature to match LLVM 19

In llvm/llvm-project@9067070d91e9d8cdd8509ffa56a076f08a3d7281 they ended up largely reverting
llvm/llvm-project@e81796671890b59c110f8e41adc7ca26f8484d20. This means the change we did in
rust-lang/rust@b378059e6b2573c5356423fa31d184a89a3b6029 is now only corrct for LLVM 18...so we have to adjust again.

``@rustbot`` label: +llvm-main
tree: a0ef341235314ecaed11a3c7314fd21dbcf3fb9e
  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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