[Flang][OpenMP] verification of lowering to FIR failed on OpenMP task depend with array section of derived-type component

Reproducer:
https://godbolt.org/z/c6b385co9
```f90
integer :: a(2) = (/0,1/)

type t
integer :: b(2)
end type

type(t) :: s(2)
!$omp task depend(out: s(a)%b(1))
!$omp end task
end
```

The expected behavior is that the code either compiles successfully or produces an appropriate and informative diagnostic.

Start with the Fortran reproducer in the issue and the linked Compiler Explorer example at https://godbolt.org/z/c6b385co. Investigate the OpenMP task-depend lowering to FIR for an array section of a derived-type component. Done means the example compiles successfully or emits an appropriate, informative diagnostic.

Written by the indexing model from the issue text.