[NFC][SemaHLSL] Remove check dependent on non-deterministic root element association (#148649)

- when there are duplicate (equivalent) `RangeInfo`s created we will
attempt to `llvm::sort` or `llvm::stable_sort` them, it does not appear
deterministic in which order they will be sorted (because they are
equivalent)

- when `DLLVM_ENABLE_EXSTENSIVE_CHECKS` is enabled, it appears to deal
with this tie-breaker sorting the list differently than when it is not
enabled, this causes one of the test cases to fail because the
diagnostic is produced, not in a different order, but with a different
root element associated with an identical `RangeInfo`

- functionally this makes no difference to the diagnostic being produced
and the removed test-case was added just as a nicety to demonstrate how
the diagnostics might look

- the test above the removed will correctly demonstrate that the
`SourceLocation` will be set to the correct column, and, the `-verify`
portion of this testcase will ensure that we still generate a diagnostic
for each duplicate

- therefore, it is safe to remove this portion of the test-case that can
have a non-deterministic association of root element

This resolves the build issues reported
[here](https://github.com/llvm/llvm-project/pull/147115#issuecomment-3069543491)
and
[here](https://github.com/llvm/llvm-project/pull/147800#issuecomment-3069797406)
1 file changed
tree: 4bd9c3dc465cf500d440fd831cd379b1b78fcee9
  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. runtimes/
  25. third-party/
  26. utils/
  27. .clang-format
  28. .clang-format-ignore
  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
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