[Flang] Make all tests work with lit's internal shell

This patch removes REQUIRES: shell lines and updates the tests to not
need a shell, or adds REQUIRES lines for Linux where relevant. A lot of
these seem to have gotten introduced in
58c3f20bbf51f454ffb38ddb700a1d5ad374dc7b, but many are no longer
relevant as these tests no longer use shell scripts.

There was one test (missing_newline.f90) that needed to be modified to
work. Lit doesn't recognize -ne correctly for echo and the options need
to be split into separate flags.

Reviewers: clementval, Meinersbur, kiranchandramohan, klausler

Reviewed By: clementval

Pull Request: https://github.com/llvm/llvm-project/pull/156115
16 files changed
tree: c1f76cdd8a09f827446d38a9ae56f78564705c7e
  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

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