Reify type params on map literals

test/codegen_expected/corelib/map_keys2_test.js

 dart_library.library('corelib/map_keys2_test', null, /* Imports */[
   'dart_sdk',
   'expect'
 ], function load__map_keys2_test(exports, dart_sdk, expect) {
   'use strict';
   const core = dart_sdk.core;
   const dart = dart_sdk.dart;
   const dartx = dart_sdk.dartx;
   const expect$ = expect.expect;
   const map_keys2_test = Object.create(null);
   let MapOfString$int = () => (MapOfString$int = dart.constFn(core.Map$(core.String, core.int)))();
   let MapOfString$bool = () => (MapOfString$bool = dart.constFn(core.Map$(core.String, core.bool)))();
   let IterableOfString = () => (IterableOfString = dart.constFn(core.Iterable$(core.String)))();
   let IterableOfbool = () => (IterableOfbool = dart.constFn(core.Iterable$(core.bool)))();
   let VoidTodynamic = () => (VoidTodynamic = dart.constFn(dart.definiteFunctionType(dart.dynamic, [])))();
   let const$;
   let const$0;
   map_keys2_test.main = function() {
-    let map1 = dart.map({foo: 42, bar: 499});
+    let map1 = dart.map({foo: 42, bar: 499}, core.String, core.int);
     let map2 = dart.map();
-    let map3 = const$ || (const$ = dart.const(dart.map({foo: 42, bar: 499})));
+    let map3 = const$ || (const$ = dart.const(dart.map({foo: 42, bar: 499}, core.String, core.int)));
     let map4 = const$0 || (const$0 = dart.const(dart.map()));
     let map5 = MapOfString$int().new();
     map5[dartx.set]("foo", 43);
     map5[dartx.set]("bar", 500);
     let map6 = MapOfString$bool().new();
     expect$.Expect.isTrue(IterableOfString().is(map1[dartx.keys]));
     expect$.Expect.isTrue(IterableOfbool().is(map1[dartx.keys]));
     expect$.Expect.isTrue(IterableOfString().is(map2[dartx.keys]));
     expect$.Expect.isTrue(IterableOfbool().is(map2[dartx.keys]));
     expect$.Expect.isTrue(IterableOfString().is(map3[dartx.keys]));
     expect$.Expect.isTrue(IterableOfbool().is(map3[dartx.keys]));
     expect$.Expect.isTrue(IterableOfString().is(map4[dartx.keys]));
     expect$.Expect.isTrue(IterableOfbool().is(map4[dartx.keys]));
     expect$.Expect.isTrue(IterableOfString().is(map5[dartx.keys]));
     expect$.Expect.isFalse(IterableOfbool().is(map5[dartx.keys]));
     expect$.Expect.isTrue(IterableOfString().is(map6[dartx.keys]));
     expect$.Expect.isFalse(IterableOfbool().is(map6[dartx.keys]));
   };
   dart.fn(map_keys2_test.main, VoidTodynamic());
   // Exports:
   exports.map_keys2_test = map_keys2_test;
 });