Reify type params on map literals

test/codegen_expected/language/string_interpolation_newline_test.js

 dart_library.library('language/string_interpolation_newline_test', null, /* Imports */[
   'dart_sdk'
 ], function load__string_interpolation_newline_test(exports, dart_sdk) {
   'use strict';
   const core = dart_sdk.core;
   const _interceptors = dart_sdk._interceptors;
   const dart = dart_sdk.dart;
   const dartx = dart_sdk.dartx;
   const string_interpolation_newline_test = Object.create(null);
   let JSArrayOfString = () => (JSArrayOfString = dart.constFn(_interceptors.JSArray$(core.String)))();
   let VoidTodynamic = () => (VoidTodynamic = dart.constFn(dart.definiteFunctionType(dart.dynamic, [])))();
   string_interpolation_newline_test.main = function() {
     let expected = '[[{{}: {}}]]';
-    let a = dart.str`${JSArrayOfString().of([dart.str`${JSArrayOfString().of([dart.str`${dart.map({[dart.str`${dart.map()}`]: dart.map()})}`])}`])}`;
-    let b = dart.str`${JSArrayOfString().of([dart.str`${JSArrayOfString().of([dart.str`${dart.map({[dart.str`${dart.map()}`]: dart.map()})}`])}`])}`;
-    let c = dart.str`${JSArrayOfString().of([dart.str`${JSArrayOfString().of([dart.str`${dart.map({[dart.str`${dart.map()}`]: dart.map()})}`])}`])}`;
+    let a = dart.str`${JSArrayOfString().of([dart.str`${JSArrayOfString().of([dart.str`${dart.map({[dart.str`${dart.map()}`]: dart.map()}, core.String, core.Map)}`])}`])}`;
+    let b = dart.str`${JSArrayOfString().of([dart.str`${JSArrayOfString().of([dart.str`${dart.map({[dart.str`${dart.map()}`]: dart.map()}, core.String, core.Map)}`])}`])}`;
+    let c = dart.str`${JSArrayOfString().of([dart.str`${JSArrayOfString().of([dart.str`${dart.map({[dart.str`${dart.map()}`]: dart.map()}, core.String, core.Map)}`])}`])}`;
     if (expected != a) dart.throw(dart.str`expecteda: ${expected} != ${a}`);
     if (a != b) dart.throw(dart.str`ab: ${a} != ${b}`);
     if (b != c) dart.throw(dart.str`bc: ${b} != ${c}`);
     core.print(dart.str`${a}${b}${c}`);
   };
   dart.fn(string_interpolation_newline_test.main, VoidTodynamic());
   // Exports:
   exports.string_interpolation_newline_test = string_interpolation_newline_test;
 });