Always explicitely give a type to HInvokeStatic, and make the literal map know it's a map.

sdk/lib/_internal/compiler/implementation/js_backend/backend.dart

Index: sdk/lib/_internal/compiler/implementation/js_backend/backend.dart
===================================================================
--- sdk/lib/_internal/compiler/implementation/js_backend/backend.dart	(revision 18207)
+++ sdk/lib/_internal/compiler/implementation/js_backend/backend.dart	(working copy)
@@ -893,6 +893,12 @@
       addInterceptors(jsIntClass, enqueuer);
       addInterceptors(jsDoubleClass, enqueuer);
       addInterceptors(jsNumberClass, enqueuer);
+    } else if (cls == compiler.mapClass) {
+      // The backend will use a literal list to initialize the entries
+      // of the map.
+      if (enqueuer.isResolutionQueue) {
+        enqueuer.registerInstantiatedClass(compiler.listClass); 
+      }
     }
   }