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cc1: Fix order of parameters in pcompare()

Pcompare() expects first left and right parameters, but it was
called with right and left.

--- a/src/cmd/cc/cc1/expr.c

+++ b/src/cmd/cc/cc1/expr.c

@@ -368,7 +368,7 @@

 	rtp = rp->type;

 	if (ltp->op == PTR || rtp->op == PTR) {

-		return pcompare(op, rp, lp);

+		return pcompare(op, lp, rp);

 	} else if ((ltp->prop & TARITH) && (rtp->prop & TARITH)) {

 		arithconv(&lp, &rp);

 		return convert(node(op, lp->type, lp, rp), inttype, 1);;