Reify type params on map literals

test/codegen_expected/language/issue10204_test.js

 dart_library.library('language/issue10204_test', null, /* Imports */[
   'dart_sdk',
   'expect'
 ], function load__issue10204_test(exports, dart_sdk, expect) {
   'use strict';
   const core = dart_sdk.core;
   const _interceptors = dart_sdk._interceptors;
   const dart = dart_sdk.dart;
   const dartx = dart_sdk.dartx;
   const expect$ = expect.expect;
@@ skipping 10 matching lines @@
     refine(a, b) {
       return dart.str`${a}${b}`;
     }
   };
   dart.setSignature(issue10204_test.Tupe, {
     constructors: () => ({new: dart.definiteFunctionType(issue10204_test.Tupe, [])}),
     methods: () => ({refine: dart.definiteFunctionType(dart.dynamic, [dart.dynamic, dart.dynamic])})
   });
   issue10204_test.Node = class Node extends core.Object {
     new() {
-      this.inputs = dart.map({a: dart.const(new issue10204_test.Tupe()), b: dart.const(new issue10204_test.Tupe())});
+      this.inputs = dart.map({a: dart.const(new issue10204_test.Tupe()), b: dart.const(new issue10204_test.Tupe())}, core.String, issue10204_test.Tupe);
       this.selector = null;
       this.isCallOnInterceptor = false;
     }
     getDartReceiver() {
       return dart.test(this.isCallOnInterceptor) ? this.inputs[dartx.get]("a") : this.inputs[dartx.get]("b");
     }
   };
   dart.setSignature(issue10204_test.Node, {
     methods: () => ({getDartReceiver: dart.definiteFunctionType(dart.dynamic, [])})
   });
   issue10204_test.A = class A extends core.Object {
     visitInvokeDynamicMethod(node) {
       let receiverType = dart.dload(dart.dsend(node, 'getDartReceiver'), 'instructionType');
       return dart.dsend(receiverType, 'refine', dart.dload(node, 'selector'), dart.dload(node, 'selector'));
     }
   };
   dart.setSignature(issue10204_test.A, {
     methods: () => ({visitInvokeDynamicMethod: dart.definiteFunctionType(dart.dynamic, [dart.dynamic])})
   });
   issue10204_test.main = function() {
     expect$.Expect.equals('nullnull', JSArrayOfA().of([new issue10204_test.A()])[dartx.last].visitInvokeDynamicMethod(new issue10204_test.Node()));
   };
   dart.fn(issue10204_test.main, VoidTodynamic());
   // Exports:
   exports.issue10204_test = issue10204_test;
 });