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[cc2-qbe] Add support for OCPL and ONEG in sethi()

This operators are implemented using another operators,
so the best place for doing this operation is in sethi().

--- a/cc2/arch/qbe/cgen.c

+++ b/cc2/arch/qbe/cgen.c

@@ -59,7 +59,24 @@

 	case OCONST:

 		np->address = 11;

 		break;

+	case OCPL:

+		np->op = OAND;

+		rp = newnode(OCONST);

+		rp->type = np->type;

+		rp->u.i = 0;

+		rp->u.i = ~np->u.i;

+		goto binary;

+	case ONEG:

+		np->op = OSUB;

+		rp = lp;

+		lp = newnode(OCONST);

+		lp->type = np->type;

+		if (np->type.flags & INTF)

+			lp->u.i = 0;

+		else

+			lp->u.f = 0.0;

 	default:

+	binary:

 		lp = sethi(lp);

 		rp = sethi(rp);

 		break;