Fix access to returnTypeOf

pkg/compiler/lib/src/ssa/kernel_ast_adapter.dart

 // Copyright (c) 2016, 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.
 
 import 'package:js_runtime/shared/embedded_names.dart';
 import 'package:kernel/ast.dart' as ir;
 
 import '../common.dart';
 import '../compiler.dart';
 import '../constants/expressions.dart';
@@ skipping 158 matching lines @@
           variable, () => new SyntheticLocal("x", null));
     }
     return getElement(variable) as LocalElement;
   }
 
   bool getCanThrow(ir.Node procedure, ClosedWorld closedWorld) {
     FunctionElement function = getElement(procedure);
     return !closedWorld.getCannotThrow(function);
   }
 
-  TypeMask returnTypeOf(ir.Member node) {
+  TypeMask returnTypeOf(ir.Procedure node) {
     return TypeMaskFactory.inferredReturnTypeForElement(
-        getElement(node), _globalInferenceResults);
+        getMethod(node), _globalInferenceResults);
   }
 
   SideEffects getSideEffects(ir.Node node, ClosedWorld closedWorld) {
     return closedWorld.getSideEffectsOfElement(getElement(node));
   }
 
   FunctionSignature getFunctionSignature(ir.FunctionNode function) {
     return getElement(function).asFunctionElement().functionSignature;
   }
 
@@ skipping 629 matching lines @@
       JumpTarget continueTarget =
           astAdapter.getJumpTarget(switchCase, isContinueTarget: true);
       assert(continueTarget is KernelJumpTarget);
       targetIndexMap[continueTarget] = switchIndex;
       assert(builder.jumpTargets[continueTarget] == null);
       builder.jumpTargets[continueTarget] = this;
       switchIndex++;
     }
   }
 }