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[cc2] Update the number of cases per switch

This is a very important field because it will determinate
which of the possible implementation will be used for the
switch.

--- a/cc2/parser.c

+++ b/cc2/parser.c

@@ -337,15 +337,18 @@

 waft(Node *np)

 {

 	Node *p;

+	struct swtch *cur;

 	if (swp == swtbl)

 		error(EWTACKU);

-	p = swp[-1].last;

+	cur = swp - 1;

+	p = cur->last;

 	np->next = p->next;

 	np->prev = p;

 	p->next = np;

-	swp[-1].last = np;

+	cur->last = np;

+	cur->nr++;

 }

 static void