[clang] Rewrite tests relying on shell environment variable features

This patch rewrites a couple tsts that fail when running with lit's
internal shell enabled due to assumptions about setting environment
variables. There were a couple cases where there was an implict env.
Most of the cases needed unset swapped for env -u.

Toeards #102699.

Reviewers: petrhosek, efriedma-quic, Sirraide, carlocab, rnk, ilovepi

Reviewed By: carlocab, rnk, ilovepi

Pull Request: https://github.com/llvm/llvm-project/pull/156904
7 files changed
tree: 41b7d3b108ad67e85587e97997a64ede5b565e7a
  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

The LLVM Compiler Infrastructure

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Welcome to the LLVM project!

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