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[cc2] Add a ONOP statement for every label

This nop statement helps to have some statement in the same position
where the label is set. We do not depend of being the last statement
or setting some variable for the next statement.

--- a/cc2/parser.c

+++ b/cc2/parser.c

@@ -569,20 +569,6 @@

 }

 static void

-labeldcl(void)

-{

-	Node *np;

-	Symbol *sym;

-

-	np = pop();

-	sym = np->u.sym;

-	delnode(np);

-	nextline();

-	stmtp->label = sym;

-	sym->u.nlabel = stmtp;

-}

-

-static void

 addstmt(Node *np)

 {

 	if (!curfun->u.nlabel)

@@ -590,6 +576,20 @@

 	else

 		stmtp->stmt = np;

 	stmtp = np;

+}

+

+static void

+labeldcl(void)

+{

+	Node *np;

+	Symbol *sym;

+

+	np = pop();

+	np->op = ONOP;

+	sym = np->u.sym;

+	sym->kind = SLABEL;

+	np->label = sym;

+	addstmt(np);

 }

 static void