rm SlowDrvrIterator

Signed-off-by: James Cherry <[email protected]>

include/sta/Network.hh

@@ -238,6 +238,7 @@ public:
   // the other primitives.
   LeafInstanceIterator *leafInstanceIterator() const;
   LeafInstanceIterator *leafInstanceIterator(const Instance *hier_inst) const;
+  InstanceSeq leafInstances();
   // Iterate over the children of an instance.
   virtual InstanceChildIterator *
   childIterator(const Instance *instance) const = 0;

include/sta/Sta.hh

@@ -1106,9 +1106,8 @@ public:
   // with normal constant propagate for timing.
   void clearLogicConstants();
 
-  // Iterator for instances sorted by max driver pin slew.
-  // Caller owns iterator and iterator->container().
-  SlowDrvrIterator *slowDrvrIterator();
+  // Instances sorted by max driver pin slew.
+  InstanceSeq slowDrivers(int count);
 
   // Make parasitic analysis points.
   // per_corner per_min_max     ap_count