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[cc2-qbe] Handle left casts in abbreviations

Due to the difference of sizes it is possible to have casts in
the lhs part of an expression, which must be handle out of
lhs(), because it is only due to the double meaning of
abbreviations (being a lhs() and rhs()).

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

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

@@ -563,6 +563,15 @@

 			aux2.right = np->right;

 			aux2.left = np->left;

 			r = rhs(&aux2, &aux1);

+			Node aux3;

+			if (l->op == OCAST) {

+				aux3.type = l->left->type;

+				aux3.op = OCAST;

+				aux3.left = r;

+				aux3.right = NULL;

+				r = &aux3;

+				l = l->left;

+			}

 		case 0:

 			/* TODO: see what is the most difficult */

 			lhs(l, &aux2);