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[cc2-qbe] Jump at the end in switches

When we arrive to the end of a switch if-else-if chain
we have to jump to the default label. If we do not have
default case it means that we have to jump to the end of
the switch, but we always have to jump.

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

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

@@ -428,12 +428,12 @@

 		switch (np->op) {

 		case OESWITCH:

-			if (deflabel) {

-				aux1.op = OJMP;

-				aux1.label = NULL;

-				aux1.u.sym = deflabel;

-				cgen(&aux1);

-			}

+			if (!deflabel)

+				deflabel = np->u.sym;

+			aux1.op = OJMP;

+			aux1.label = NULL;

+			aux1.u.sym = deflabel;

+			cgen(&aux1);

 			return;

 		case OCASE:

 			aux1 = *np;