decl.c (gnat_to_gnu_entity): Also promote the alignment of constant objects, but...

decl.c (gnat_to_gnu_entity): Also promote the alignment of constant objects, but not exceptions.

	* decl.c (gnat_to_gnu_entity) <object>: Also promote the alignment of
	constant objects, but not exceptions.
	* trans.c (add_decl_expr): Use gnat_types_compatible_p for type
	compatibility test.
	* utils.c (create_var_decl_1): Likewise.
	* utils2.c (build_binary_op) <MODIFY_EXPR>: Also use the padded view of
	the type when copying to padded object and the source is a constructor.

From-SVN: r134483