misc.c (gnat_type_max_size): Try to return a meaningful value for array types with...

misc.c (gnat_type_max_size): Try to return a meaningful value for array types with TYPE_INDEX_TYPE set on...

	* gcc-interface/misc.c (gnat_type_max_size): Try to return a meaningful
	value for array types with TYPE_INDEX_TYPE set on their domain type.
	* gcc-interface/utils.c (max_size): For operations and expressions, do
	not build a new node if the operands have not changed or are missing.

From-SVN: r245698