[clang][DependencyScanning] Unify initVFS helpers to return OverlayFileSystem (NFC) (#172166)

This patch is part of a series of splitting the work from #169964 into
smaller changes (see review linked below).

As part of this work, the regular and by-name dependency scanning APIs
need to be extended to allow the VFS to be initialized via the
initVFS helpers before invoking the scanning API, with the resulting
overlay filesystem passed into the worker instead.

To make the newly added API changes consistent, this patch updates both
helpers to return an OverlayFileSystem.

https://github.com/llvm/llvm-project/pull/169964#pullrequestreview-3545879529
2 files changed
tree: ae4225f0e8bcf15dbb90dff4a716d69dfd471ff4
  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
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