decl.c (gnat_to_gnu_entity): Set TYPE_NONALIASED_COMPONENT on the array type only if appropriate.

	* gcc-interface/decl.c (gnat_to_gnu_entity) <E_String_Literal_Subtype>:
	Set TYPE_NONALIASED_COMPONENT on the array type only if appropriate.
	(copy_alias_set): Assert that arrays have the same aliasing settings.
	(substitute_in_type) <ARRAY_TYPE>: Copy TYPE_NONALIASED_COMPONENT.

From-SVN: r144038