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

sdk/lib/_internal/compiler/implementation/native_handler.dart

 // Copyright (c) 2012, the Dart project authors.  Please see the AUTHORS file
 // for details. All rights reserved. Use of this source code is governed by a
 // BSD-style license that can be found in the LICENSE file.
 
 library native;
 
 import 'dart:collection' show Queue;
 import 'dart:uri';
 import 'dart2jslib.dart' hide SourceString;
 import 'dart_types.dart';
@@ skipping 806 matching lines @@
   NativeEmitter nativeEmitter = builder.emitter.nativeEmitter;
 
   HInstruction convertDartClosure(Element parameter, FunctionType type) {
     HInstruction local = builder.localsHandler.readLocal(parameter);
     Constant arityConstant =
         builder.constantSystem.createInt(type.computeArity());
     HInstruction arity = builder.graph.addConstant(arityConstant);
     // TODO(ngeoffray): For static methods, we could pass a method with a
     // defined arity.
     Element helper = builder.backend.getClosureConverter();
-    builder.pushInvokeHelper2(helper, local, arity);
+    builder.pushInvokeHelper2(helper, local, arity, HType.UNKNOWN);
     HInstruction closure = builder.pop();
     return closure;
   }
 
   // Check which pattern this native method follows:
   // 1) foo() native;
   //      hasBody = false
   // 2) foo() native "bar";
   //      No longer supported, this is now done with @JSName('foo') and case 1.
   // 3) foo() native "return 42";
@@ skipping 55 matching lines @@
   } else {
     if (parameters.parameterCount != 0) {
       compiler.cancel(
           'native "..." syntax is restricted to functions with zero parameters',
           node: nativeBody);
     }
     LiteralString jsCode = nativeBody.asLiteralString();
     builder.push(new HForeign.statement(jsCode.dartString, <HInstruction>[]));
   }
 }