[HLSL][NFC] Refactor HLSLExternalSemaSource (#131032)

Moving builder classes into separate files
`HLSLBuiltinTypeDeclBuilder.cpp`/`.h`, changing a some
`HLSLExternalSemaSource` methods to private and removing unused methods.

This is a prep work before we start adding more builtin types and
methods, like textures, resource constructors or matrices. For example
constructors could make use of the `BuiltinTypeMethodBuilder`, but this
helper class was defined in `HLSLExternalSemaSource.cpp` after the
method that creates a constructor. Rather than reshuffling the code one
big source file I am moving the builders into a separate cpp & header
file and placing the helper classes declarations up top.

Currently the new header only exposes `BuiltinTypeDeclBuilder` to
`HLSLExternalSemaSource`. In the future but we might decide to expose
more helper classes as needed.
5 files changed
tree: d575f50d46f184b86eec4ff01be9eb48ab0334e6
  1. .ci/
  2. .github/
  3. bolt/
  4. clang/
  5. clang-tools-extra/
  6. cmake/
  7. compiler-rt/
  8. cross-project-tests/
  9. flang/
  10. flang-rt/
  11. libc/
  12. libclc/
  13. libcxx/
  14. libcxxabi/
  15. libunwind/
  16. lld/
  17. lldb/
  18. llvm/
  19. llvm-libgcc/
  20. mlir/
  21. offload/
  22. openmp/
  23. polly/
  24. pstl/
  25. runtimes/
  26. third-party/
  27. utils/
  28. .clang-format
  29. .clang-tidy
  30. .git-blame-ignore-revs
  31. .gitattributes
  32. .gitignore
  33. .mailmap
  34. CODE_OF_CONDUCT.md
  35. CONTRIBUTING.md
  36. LICENSE.TXT
  37. pyproject.toml
  38. README.md
  39. SECURITY.md
README.md

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