* gcc-interface/decl.c (gnat_to_gnu_entity) <E_Array_Type>: Remove
	superfluous computation for the max size.
	<E_Array_Subtype>: Likewise.  Make sure that the max size calculation
	does not overflow at compile time.


git-svn-id: svn+ssh://gcc.gnu.org/svn/gcc/trunk@216725 138bc75d-0d04-0410-961f-82ee72b054a4