* gcc-interface/ada-tree.def (PLUS_NOMOD_EXPR): New tree code.
	(MINUS_NOMOD_EXPR): Likewise.
	* gcc-interface/utils2.c (build_binary_op) <PREINCREMENT_EXPR>: Make
	unreachable.
	<PLUS_NOMOD_EXPR>: New case.
	<MINUS_NOMOD_EXPR>: Likewise.
	* gcc-interface/trans.c (Loop_Statement_to_gnu): Build increment-and-
	assignment statement instead of using an increment operator.

From-SVN: r141714