tree-object-size.c (addr_object_size): Handle unions with array in it as last field of structs in __bos (...

	* tree-object-size.c (addr_object_size): Handle unions with
	array in it as last field of structs in __bos (, 1) as __bos (, 0).

	* gcc.dg/builtin-object-size-6.c: Adjust expected values. 
	* gcc.dg/builtin-object-size-8.c: New test. 
	* g++.dg/ext/builtin-object-size1.C: Adjust expected values.
	* g++.dg/ext/builtin-object-size2.C: Likewise.

From-SVN: r149825