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[cc2] Update the number of cases per switch v2

--- a/cc2/parser.c

+++ b/cc2/parser.c

@@ -32,6 +32,7 @@

 struct swtch {

 	int nr;

+	Node *first;

 	Node *last;

 };

@@ -354,21 +355,27 @@

 static void

 bswitch(char *token, union tokenop u)

 {

-	if (swp++ == &swtbl[NR_BLOCK+1])

+	struct swtch *cur;

+

+	if (swp == &swtbl[NR_BLOCK+1])

 		error(EWTACKO);

+	cur = swp++;

+	cur->nr = 0;

 	jump(token, u);

-	swp->nr = 0;

-	swp->last = push(pop());

+	cur->first = cur->last = push(pop());

 }

 static void

 eswitch(char *token, union tokenop u)

 {

+	struct swtch *cur;

+

 	if (swp == swtbl)

 		error(EWTACKU);

 	jump(token, u);

 	waft(pop());

-	--swp;

+	cur = swp--;

+	cur->first->u.i = cur->nr;

 }

 static void