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Convert incdec() to use new fields in Type

--- a/cc1/expr.c

+++ b/cc1/expr.c

@@ -513,17 +513,14 @@

 	chklvalue(np);

-	switch (BTYPE(np)) {

-	case PTR:

-		if (!tp->defined)

-			error("invalid use of undefined type");

-		inc = sizeofnode(tp->type);

-		break;

-	case INT:

-	case FLOAT:

+	if (!tp->defined) {

+		errorp("invalid use of undefined type");

+		return np;

+	} else if (tp->arith) {

 		inc = constnode(one);

-		break;

-	default:

+	} else if (tp->op == PTR) {

+		inc = sizeofnode(tp->type);

+	} else {

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

 		return np;

 	}