decl.c (gnat_to_gnu_entity): Revert previous change that creates a special...

decl.c (gnat_to_gnu_entity): Revert previous change that creates a special VAR_DECL for debugging purposes.

	* gcc-interface/decl.c (gnat_to_gnu_entity) <object>: Revert previous
	change that creates a special VAR_DECL for debugging purposes.  For an
	aliased object with an unconstrained nominal subtype, make its type a
	thin reference to the underlying object.
	* gcc-interface/utils2.c (build_unary_op) <INDIRECT_REF>: Deal with
	expressions built for the initialization of above objects.

From-SVN: r184593