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cc2-qbe: Call sethi() for subops

When nodes are created because there are abbreviations we must
set the sethi numbers that drive the code generation, otherwise
we can have unexpected results.

--- a/src/cmd/cc/cc2/target/qbe/cgen.c

+++ b/src/cmd/cc/cc2/target/qbe/cgen.c

@@ -534,7 +534,7 @@

 		aux.left = ret;

 		aux.right = r;

 		aux.type = np->type;

-		r = rhs(&aux);

+		r = rhs(sethi(&aux));

 		break;

 	default:

 		/* assign abbreviation */

@@ -542,7 +542,8 @@

 		aux.left = l;

 		aux.right = r;

 		aux.type = np->type;

-		r = complex(&aux);

+		aux.address = np->address;

+		r = sethi(&aux);

 	case 0:

 		if (l->complex >= r->complex) {

 			l = lhs(l);