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[cc2] Fix parsing of ternary operators

The parser was correct, but the generated tree was not
correct, because the names of ask and colon were interchanged
and we were not joint the ? with the :

--- a/cc2/parser.c

+++ b/cc2/parser.c

@@ -272,7 +272,7 @@

 static void

 ternary(char *token, union tokenop u)

 {

-	Node *ask = newnode(OCOLON), *colon = newnode(OASK);

+	Node *ask = newnode(OASK), *colon = newnode(OCOLON);

 	Type *tp = gettype(token+1);

 	colon->right = pop();

@@ -280,6 +280,7 @@

 	ask->type = *tp;

 	ask->left = pop();

+	ask->right = colon;

 	push(ask);

 }