* exp_disp.adb (Expand_Dispatching_Call): Propagate the convention on

	* exp_disp.adb (Expand_Dispatching_Call): Propagate the convention on
	the designated subprogram type and also set Is_Dispatch_Table_Entity.
	(Expand_Interface_Thunk): Propagate the convention on the thunk.
	(Set_CPP_Constructors_Old): Set Is_Constructor and Convention_CPP on
	the internal view of the constructors.
	(Set_CPP_Constructors): Likewise.
	* sem_prag.adb (Analyze_Pragma) <Pragma_CPP_Constructor>: Set the
	convention on the function.
	* gcc-interface/gigi.h (is_cplusplus_method): Declare.
	* gcc-interface/decl.c (Has_Thiscall_Convention): New macro.
	(gnat_to_gnu_entity) <E_Subprogram_Type>: Test it to set the `thiscall'
	calling convention
	(get_minimal_subprog_decl): Likewise.
	(is_cplusplus_method): New predicate.
	* gcc-interface/trans.c (Attribute_to_gnu) <Attr_Access>: Issue an
	error on access to C++ constructor or member function.

git-svn-id: svn+ssh://gcc.gnu.org/svn/gcc/trunk@189199 138bc75d-0d04-0410-961f-82ee72b054a4