[clang][transformer] Add `merge` range-selector for selecting the merge of two ranges. (#169560)

This new range-selector `merge` takes in two ranges and selects from
min(begin locs of input ranges) to max(end locs of input ranges). This
is useful for when the user needs to select a range that is a merge of
two arbitrary ranges (potentially overlapped and out of order).

The existing `enclose` range-selector does something similar but it
requires the first range's begin loc appears before the second range's
end loc. The `merge` range-selector complements `enclose`.

---------

Co-authored-by: Yitzhak Mandelbaum <ymand@users.noreply.github.com>
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  1. .ci/
  2. .github/
  3. bolt/
  4. clang/
  5. clang-tools-extra/
  6. cmake/
  7. compiler-rt/
  8. cross-project-tests/
  9. flang/
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  11. libc/
  12. libclc/
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  14. libcxxabi/
  15. libsycl/
  16. libunwind/
  17. lld/
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  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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