[libcxx][test] Amend XFAIL directive in no_unique_address tests (#67849)

This PR amends the `XFAIL` directive to clang < 18 in
no_unique_address.compile.pass.cpp tests.

Since PR 67199 implements the [[msvc::no_unique_address]] attribute,
these tests pass in a windows-x64 build against ToT clang-cl:

```
********************
Unexpectedly Passed Tests (3):
llvm-libc++-static-clangcl.cfg.in :: libcxx/ranges/range.adaptors/range.lazy.split/no_unique_address.compile.pass.cpp
llvm-libc++-static-clangcl.cfg.in :: libcxx/ranges/range.adaptors/range.split/no_unique_address.compile.pass.cpp
llvm-libc++-static-clangcl.cfg.in :: libcxx/ranges/range.factories/range.istream.view/no_unique_address.compile.pass.cpp
```

---------

Co-authored-by: Caslyn Tonelli <[email protected]>
3 files changed
tree: 7ec19ab398c6753224391b79fb05763f95fda00d
  1. .ci/
  2. .github/
  3. bolt/
  4. clang/
  5. clang-tools-extra/
  6. cmake/
  7. compiler-rt/
  8. cross-project-tests/
  9. flang/
  10. libc/
  11. libclc/
  12. libcxx/
  13. libcxxabi/
  14. libunwind/
  15. lld/
  16. lldb/
  17. llvm/
  18. llvm-libgcc/
  19. mlir/
  20. openmp/
  21. polly/
  22. pstl/
  23. runtimes/
  24. third-party/
  25. utils/
  26. .arcconfig
  27. .arclint
  28. .clang-format
  29. .clang-tidy
  30. .git-blame-ignore-revs
  31. .gitignore
  32. .mailmap
  33. CODE_OF_CONDUCT.md
  34. CONTRIBUTING.md
  35. LICENSE.TXT
  36. README.md
  37. SECURITY.md
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