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[cc1] Add support for union designators in emit

Union is similar to struct, but in this case we only emit the last
designated element.

--- a/cc1/code.c

+++ b/cc1/code.c

@@ -337,7 +337,7 @@

 emitdesig(Node *np, Type *tp)

 {

 	Symbol *sym;

-	size_t n;

+	size_t n; /* TODO: This should be SIZET */

 	Node *aux;

 	Type *p;

@@ -362,7 +362,11 @@

 		aux = (sym) ? *sym->u.init : convert(constnode(zero), tp, 0);

 		emitexp(OEXPR, aux);

 		break;

-	/* TODO: case UNION: */

+	case UNION:

+		n = tp->n.elem-1;

+		aux = (sym) ? sym->u.init[n] : NULL;

+		emitdesig(aux, tp->p.fields[n]->type);

+		break;

 	case STRUCT:

 	case ARY:

 		for (n = 0; n < tp->n.elem; ++n) {