Reland "[lldb-dap] Improving consistency of tests by removing concurrency." (#165688)"

This reverts commit f205be095609aa61dfac3ae729406e0af2dcd15f.

This new select mechanism has exposed the fact that the resources
the Arm Linux bot has can vary a lot. We do limit it to a low number
of parallel tests but in this case, I think it's write performance
somewhere.

Reland the changes since they work elsewhere, and disable lldb-dap
tests on Arm Linux while I fix our buildbot.
8 files changed
tree: bc2dac5ba044ca6ac5040eb29340d55cb5673c1a
  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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