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[cc2-qbe] Emit abbrev statements

Abbrev statements are the combination of a assignation
and some other operator, and they don't have special
meaning in QBE. They must be expanded.

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

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

@@ -231,6 +231,20 @@

 	return nd;

 }

+static Node *

+abbrev(Node *np)

+{

+	Node *tmp;

+

+	if (np->u.subop == 0)

+		return np->right;

+	tmp = newnode(np->u.subop);

+	tmp->type = np->type;

+	tmp->right = np->right;

+	tmp->left = np->left;

+	return np->right = cgen(tmp);

+}

+

 Node *

 cgen(Node *np)

 {

@@ -317,6 +331,7 @@

 	case ODEC:

 		abort();

 	case OASSIG:

+		r = abbrev(np);

 		switch (tp->size) {

 		case 1:

 			op = ASSTB;