[OpenMP] [Semantics] [Flang] Adding more semantic checks for USE_DEVICE_PTR...

[OpenMP] [Semantics] [Flang] Adding more semantic checks for USE_DEVICE_PTR and USE_DEVICE_ADDR clauses.

The following restrictions for USE_DEVICE_PTR and USE_DEVICE_ADDR clauses on OMP TARGET DATA directive are implemented in this patch.

  - A list item may not be specified more than once in use_device_ptr clauses that appear on the directive.
  - A list item may not be specified more than once in use_device_addr clauses that appear on the directive.
  - A list item may not be specified in both a use_device_addr clause and a use_device_ptr clause on the directive.
  - A list item that appears in a use_device_ptr or use_device_addr clause must not be a structure element.
  - A list item that appears in a use_device_ptr must be of type C_PTR.

Reviewed By: kiranchandramohan

Differential Revision: https://reviews.llvm.org/D155133