[flang-commits] [flang] [flang][OpenACC] Reland data-clause designator path handling (PR #220781)

[Eugene Epshteyn via flang-commits]

eugeneepshteyn wrote:

Please check that this gets a warning, not an error (and please add a test covering this case):
```fortran
subroutine s1(a, i)
  real :: a(10)
  integer :: i
  !$acc parallel private(a(i)) private(a(i+1-1))
  a(i) = 1.0
  !$acc end parallel
end subroutine
```

https://github.com/llvm/llvm-project/pull/220781