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Convert negation() to use the new fields in type

--- a/cc1/expr.c

+++ b/cc1/expr.c

@@ -551,16 +551,13 @@

 static Node *

 negation(char op, Node *np)

 {

-	switch (BTYPE(np)) {

-	case FTN:

-	case ARY:

-	case INT:

-	case FLOAT:

-	case PTR:

-		return exp2cond(np, 1);

-	default:

-		error("invalid argument of unary '!'");

+	np = decay(np);

+	if (!np->type->arith && np->type->op != PTR) {

+		errorp("invalid argument of unary '!'");

+		freetree(np);

+		return constnode(zero);

 	}

+	return exp2cond(np, 1);

 }

 static Symbol *