Reify type params on map literals

test/codegen_expected/language/map_literal9_test.js

 dart_library.library('language/map_literal9_test', null, /* Imports */[
   'dart_sdk',
   'expect'
 ], function load__map_literal9_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_literal9_test = Object.create(null);
   let VoidTovoid = () => (VoidTovoid = dart.constFn(dart.definiteFunctionType(dart.void, [])))();
   let const$;
   let const$0;
   map_literal9_test.main = function() {
-    let m1 = const$ || (const$ = dart.const(dart.map({"[object Object]": 0, "1": 1})));
+    let m1 = const$ || (const$ = dart.const(dart.map({"[object Object]": 0, "1": 1}, core.String, core.int)));
     expect$.Expect.isFalse(m1[dartx.containsKey](new core.Object()));
     expect$.Expect.isNull(m1[dartx.get](new core.Object()));
     expect$.Expect.isFalse(m1[dartx.containsKey](1));
     expect$.Expect.isNull(m1[dartx.get](1));
-    let m2 = const$0 || (const$0 = dart.const(dart.map({"[object Object]": 0, "1": 1, __proto__: 2})));
+    let m2 = const$0 || (const$0 = dart.const(dart.map({"[object Object]": 0, "1": 1, __proto__: 2}, core.String, core.int)));
     expect$.Expect.isFalse(m2[dartx.containsKey](new core.Object()));
     expect$.Expect.isNull(m2[dartx.get](new core.Object()));
     expect$.Expect.isFalse(m2[dartx.containsKey](1));
     expect$.Expect.isNull(m2[dartx.get](1));
   };
   dart.fn(map_literal9_test.main, VoidTovoid());
   // Exports:
   exports.map_literal9_test = map_literal9_test;
 });