Reify type params on map literals

test/codegen_expected/language/string_interpolate2_test.js

Index: test/codegen_expected/language/string_interpolate2_test.js
diff --git a/test/codegen_expected/language/string_interpolate2_test.js b/test/codegen_expected/language/string_interpolate2_test.js
index a61eb166205c10461e4c439c80eafe4b2e198c54..42468d5b60c5a582b175785d427f9dbf927db176 100644
--- a/test/codegen_expected/language/string_interpolate2_test.js
+++ b/test/codegen_expected/language/string_interpolate2_test.js
@@ -29,7 +29,7 @@ dart_library.library('language/string_interpolate2_test', null, /* Imports */[
       expect$.Expect.equals("8", dart.str`${fib[dartx.length]}`);
       expect$.Expect.equals("8", dart.str`${fib[dartx.length]}`);
       expect$.Expect.equals("8", dart.str`${fib[dartx.length]}`);
-      let map = dart.map({red: 1, green: 2, blue: 3});
+      let map = dart.map({red: 1, green: 2, blue: 3}, core.String, core.int);
       s = dart.str`green has value ${map[dartx.get]("green")}`;
       expect$.Expect.equals("green has value 2", s);
       i = 0;