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[cc1] Fix inc/dec operators

These operators are assignation operators, and they must use
the a version of the op used in expressions.

--- a/cc1/expr.c

+++ b/cc1/expr.c

@@ -608,13 +608,13 @@

 		errorp("%s of pointer to an incomplete type",

 		       (op == OINC || op == OA_ADD) ? "increment" : "decrement");

 		return np;

-	} else if (tp->op == PTR || (tp->prop & TARITH)) {

+	} else if (tp->op == PTR || tp->prop&TARITH) {

 		inc = constnode(one);

 	} else {

 		errorp("wrong type argument to increment or decrement");

 		return np;

 	}

-	return arithmetic_op(op, np, inc);

+	return arithmetic_aop(op, np, inc);

 }

 static Node *