Issue 58186
Summary [Flang][OpenMP] Reduction support for arrays
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Reporter kiranchandramohan
    Support reduction of arrays in Flang. 

Check: Does OpenMP MLIR dialect or lowering need an extension for this?

```
subroutine reduction_array(y)
  integer :: x(100), y(100,100)
  !$omp parallel
  !$omp do reduction(+:x)
  do i=1, 100
    x = x + y(:,i)
  end do
  !$omp end do
  !$omp end parallel
  print *, x
end subroutine
```
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