[flang][OpenMP]: Allow orphaned distribute construct (#163546)

If there is a call inside a TEAMS construct, and that call contains a
DISTRIBUTE construct, the DISTRIBUTE region is considered to be enclosed
by the TEAMS region (based on the dynamic extent of the construct).
Currently, Flang diagnoses this as an error, which is incorrect.
For eg :
```
 subroutine f
  !$omp distribute
  do i = 1, 100
    ...
  end do
end subroutine

subroutine g
  !$omp teams
  call f ! this call is ok, distribute enclosed by teams
  !$omp end teams
end subroutine
```
This patch adjusts the nesting check for the OpenMP DISTRIBUTE
directive. It retains the error for DISTRIBUTE directives that are
incorrectly nested lexically but downgrades it to a warning for orphaned
directives to allow dynamic nesting, such as when a subroutine with
DISTRIBUTE is called from within a TEAMS region.

Co-authored-by: Chandra Ghale <ghale@pe31.hpc.amslabs.hpecorp.net>
5 files changed
tree: 5233aaaa1353b5a714bce2012d5503347d6e5859
  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
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