additional SDK fixes. This gets all of them, once we upgrade to new analyzer

lib/runtime/dart/collection.js

 dart_library.library('dart/collection', null, /* Imports */[
   "dart_runtime/dart",
   'dart/core'
 ], /* Lazy imports */[
   'dart/_internal',
   'dart/_js_helper',
   'dart/math'
 ], function(exports, dart, core, _internal, _js_helper, math) {
   'use strict';
   let dartx = dart.dartx;
@@ skipping 3821 matching lines @@
         return this[_tree][_count];
       }
       get isEmpty() {
         return this[_tree][_count] == 0;
       }
       get iterator() {
         return new (_SplayTreeKeyIterator$(K))(this[_tree]);
       }
       toSet() {
         let setOrMap = this[_tree];
-        let set = new (SplayTreeSet$(K))(dart.as(setOrMap[_comparator], __CastType0), dart.as(setOrMap[_validKey], __CastType3));
+        let set = new (SplayTreeSet$(K))(setOrMap[_comparator], setOrMap[_validKey]);
         set[_count] = this[_tree][_count];
         set[_root] = set[_copyNode](this[_tree][_root]);
         return set;
       }
     }
     _SplayTreeKeyIterable[dart.implements] = () => [_internal.EfficientLength];
     dart.setSignature(_SplayTreeKeyIterable, {
       constructors: () => ({_SplayTreeKeyIterable: [_SplayTreeKeyIterable$(K), [_SplayTree$(K)]]}),
       methods: () => ({toSet: [core.Set$(K), []]})
     });
@@ skipping 266 matching lines @@
       'length',
       'isEmpty',
       'isNotEmpty',
       'first',
       'last',
       'single'
     ]);
     return SplayTreeSet;
   });
   let SplayTreeSet = SplayTreeSet$();
-  let __CastType0$ = dart.generic(function(K) {
-    let __CastType0 = dart.typedef('__CastType0', () => dart.functionType(core.int, [K, K]));
-    return __CastType0;
-  });
-  let __CastType0 = __CastType0$();
-  let __CastType3 = dart.typedef('__CastType3', () => dart.functionType(core.bool, [core.Object]));
   let _strings = Symbol('_strings');
   let _nums = Symbol('_nums');
   let _rest = Symbol('_rest');
   let _containsKey = Symbol('_containsKey');
   let _getBucket = Symbol('_getBucket');
   let _findBucketIndex = Symbol('_findBucketIndex');
   let _computeKeys = Symbol('_computeKeys');
   let _get = Symbol('_get');
   let _addHashTableEntry = Symbol('_addHashTableEntry');
   let _set = Symbol('_set');
@@ skipping 1884 matching lines @@
   exports.LinkedHashMapKeyIterable$ = LinkedHashMapKeyIterable$;
   exports.LinkedHashMapKeyIterable = LinkedHashMapKeyIterable;
   exports.LinkedHashMapKeyIterator$ = LinkedHashMapKeyIterator$;
   exports.LinkedHashMapKeyIterator = LinkedHashMapKeyIterator;
   exports.HashSetIterator$ = HashSetIterator$;
   exports.HashSetIterator = HashSetIterator;
   exports.LinkedHashSetCell = LinkedHashSetCell;
   exports.LinkedHashSetIterator$ = LinkedHashSetIterator$;
   exports.LinkedHashSetIterator = LinkedHashSetIterator;
 });