[NFCI][analyzer] Regularize NodeBuilder classes (#180960)

This commit removes virtual methods from the `NodeBuilder` class
hierarchy (because they were only relevant for the "enclosing builder"
feature of `StmtNodeBuilder` which was not used anywhere), then moves
the classes `IndirectGotoNodeBuilder` and `SwitchNodeBuilder` into this
hierarchy. (Previously they were independent classes with some
duplicated logic in the `generateNode()`-like functions.)

Updating `SwitchNodeBuilder` is a prerequisite for activating the
`BranchCondition` checkers on the condition of the `switch` statement
because `CheckerContext` requires the presence of a `NodeBuilder`.

Updating `IndirectGotoNodeBuilder` doesn't have any analogous goals --
I'm just doing it for the sake of consistency.

I also added some very basic tests because this area wasn't properly
covered by the old tests.

I'm planning to do more cleanup (e.g. the removal of `StmtNodeBuilder`)
in follow-up commits.
6 files changed
tree: 20e007242b685b54e48710b0d2bf7d691cd2112b
  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. libsycl/
  16. libunwind/
  17. lld/
  18. lldb/
  19. llvm/
  20. llvm-libgcc/
  21. mlir/
  22. offload/
  23. openmp/
  24. orc-rt/
  25. polly/
  26. runtimes/
  27. third-party/
  28. utils/
  29. .clang-format
  30. .clang-format-ignore
  31. .clang-tidy
  32. .git-blame-ignore-revs
  33. .gitattributes
  34. .gitignore
  35. .mailmap
  36. CODE_OF_CONDUCT.md
  37. CONTRIBUTING.md
  38. LICENSE.TXT
  39. pyproject.toml
  40. README.md
  41. SECURITY.md
README.md

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