Convert dart_utils.js to input_sdk/lib/_internal/utils.dart (#310)

test/codegen/expect/collection/priority_queue.js

 dart_library.library('collection/priority_queue', null, /* Imports */[
   "dart/_runtime",
   'dart/core',
   'dart/collection'
 ], /* Lazy imports */[
 ], function(exports, dart, core, collection) {
   'use strict';
   let dartx = dart.dartx;
   let PriorityQueue$ = dart.generic(function(E) {
     class PriorityQueue extends core.Object {}
@@ skipping 79 matching lines @@
         let last = this[_removeLast]();
         if (dart.notNull(this[_length]) > 0) {
           this[_bubbleDown](last, 0);
         }
         return result;
       }
       toList() {
         let list = core.List$(E).new();
         list[dartx.length] = this[_length];
         list[dartx.setRange](0, this[_length], this[_queue]);
-        list[dartx.sort](dart.as(this.comparison, __CastType0));
+        list[dartx.sort](dart.as(this.comparison, __CastType0$(E)));
         return list;
       }
       toSet() {
         let set = new (collection.SplayTreeSet$(E))(dart.as(this.comparison, dart.functionType(core.int, [E, E])));
         for (let i = 0; dart.notNull(i) < dart.notNull(this[_length]); i = dart.notNull(i) + 1) {
           set.add(this[_queue][dartx.get](i));
         }
         return set;
       }
       toString() {
@@ skipping 130 matching lines @@
     let __CastType0 = dart.typedef('__CastType0', () => dart.functionType(core.int, [E, E]));
     return __CastType0;
   });
   let __CastType0 = __CastType0$();
   // Exports:
   exports.PriorityQueue$ = PriorityQueue$;
   exports.PriorityQueue = PriorityQueue;
   exports.HeapPriorityQueue$ = HeapPriorityQueue$;
   exports.HeapPriorityQueue = HeapPriorityQueue;
 });