Fix typechecks for constant assignments of function to typedefs.

sdk/lib/_internal/compiler/implementation/js_backend/backend.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.
 
 part of js_backend;
 
 const VERBOSE_OPTIMIZER_HINTS = false;
 
 class JavaScriptItemCompilationContext extends ItemCompilationContext {
   final Set<HInstruction> boundsChecked = new Set<HInstruction>();
@@ skipping 648 matching lines @@
       registerInstantiatedConstantType(interceptor.dispatchedType, elements);
     } else if (constant.isType()) {
       TypeConstant typeConstant = constant;
       registerTypeLiteral(typeConstant.representedType.element,
           compiler.enqueuer.codegen, elements);
     }
   }
 
   void registerInstantiatedConstantType(DartType type, TreeElements elements) {
     Enqueuer enqueuer = compiler.enqueuer.codegen;
-    enqueuer.registerInstantiatedType(type, elements);
+    DartType instantiatedType =
+        type.kind == TypeKind.FUNCTION ? compiler.functionClass.rawType : type;
+    enqueuer.registerInstantiatedType(instantiatedType, elements);
     if (type is InterfaceType && !type.treatAsRaw &&
         classNeedsRti(type.element)) {
       enqueuer.registerStaticUse(getSetRuntimeTypeInfo());
     }
     if (type.element == typeImplementation) {
       // If we use a type literal in a constant, the compile time
       // constant emitter will generate a call to the createRuntimeType
       // helper so we register a use of that.
       enqueuer.registerStaticUse(getCreateRuntimeType());
     }
@@ skipping 1229 matching lines @@
     copy(constant.values);
     copy(constant.protoValue);
     copy(constant);
   }
 
   void visitConstructed(ConstructedConstant constant) {
     copy(constant.fields);
     copy(constant);
   }
 }