decl.c (gnat_to_gnu_entity): Process renamings before converting the expression to the type of the object.

	* decl.c (gnat_to_gnu_entity) <object>: Process renamings
	before converting the expression to the type of the object.
	* trans.c (maybe_stabilize_reference) <CONSTRUCTOR>: New case.
	Stabilize constructors for special wrapping types.

From-SVN: r131531