[Foundation] Collapse as AnyObject as! Foo cast sequences

Author: lorentey

stdlib/public/Darwin/Foundation/NSDictionary.swift

@@ -222,11 +222,9 @@ extension Dictionary : _ObjectiveCBridgeable {
     if keyStride < objectStride || valueStride < objectStride {
       var builder = _DictionaryBuilder<Key, Value>(count: d.count)
       d.enumerateKeysAndObjects({ (anyKey: Any, anyValue: Any, _) in
-        let anyObjectKey = anyKey as AnyObject
-        let anyObjectValue = anyValue as AnyObject
         builder.add(
-          key: anyObjectKey as! Key,
-          value: anyObjectValue as! Value)
+          key: anyKey as! Key,
+          value: anyValue as! Value)
       })
       result = builder.take()
     } else {

stdlib/public/Darwin/Foundation/NSSet.swift

@@ -78,7 +78,7 @@ extension Set : _ObjectiveCBridgeable {
       var set = Set(minimumCapacity: s.count)
       s.enumerateObjects({ (anyMember: Any, _) in
         // FIXME: Log a warning if `member` is already in the set.
-        set.insert(anyMember as AnyObject as! Element)
+        set.insert(anyMember as! Element)
       })
       result = set
       return
@@ -88,7 +88,7 @@ extension Set : _ObjectiveCBridgeable {
     // an NSSet.
     var builder = _SetBuilder<Element>(count: s.count)
     s.enumerateObjects({ (anyMember: Any, _) in
-      builder.add(member: anyMember as AnyObject as! Element)
+      builder.add(member: anyMember as! Element)
     })
     result = builder.take()
   }