Auto merge of #142259 - sayantn:simplify-intrinsics, r=workingjubilee

Simplify implementation of Rust intrinsics by using type parameters in the cache

The current implementation of intrinsics have a lot of duplication to handle different overloads of overloaded LLVM intrinsic. This PR uses the **base name and the type parameters** in the cache instead of the full, overloaded name. This has the benefit that `call_intrinsic` doesn't need to provide the full name, rather the type parameters (which is most of the time more available). This uses `LLVMIntrinsicCopyOverloadedName2` to get the overloaded name from the base name and the type parameters, and only uses it to declare the function.

(originally was part of rust-lang/rust#140763, split off later)

`@rustbot` label A-codegen A-LLVM
r? codegen
tree: 3a83bc9c50c37eca1766e712a454eccf7777d63b
  1. .cargo/
  2. .github/
  3. .vscode/
  4. assets/
  5. bench_data/
  6. crates/
  7. docs/
  8. editors/
  9. lib/
  10. xtask/
  11. .editorconfig
  12. .git-blame-ignore-revs
  13. .gitattributes
  14. .gitignore
  15. .typos.toml
  16. Cargo.lock
  17. Cargo.toml
  18. clippy.toml
  19. CONTRIBUTING.md
  20. LICENSE-APACHE
  21. LICENSE-MIT
  22. PRIVACY.md
  23. README.md
  24. rust-version
  25. rustfmt.toml
  26. triagebot.toml
README.md

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