Split getClosureRepresentationInfo into MemberEntity and (ir/ast) nodes

pkg/compiler/lib/src/js_emitter/runtime_type_generator.dart

 // Copyright (c) 2014, 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 dart2js.js_emitter.runtime_type_generator;
 
 import '../closure.dart'
     show ClosureRepresentationInfo, ClosureFieldElement, ClosureConversionTask;
 import '../common.dart';
 import '../common/names.dart' show Identifiers;
@@ skipping 157 matching lines @@
         result.addIsTest(other, _namer.operatorIs(other), js('1'));
       }
     }
 
     void generateFunctionTypeSignature(
         FunctionEntity method, FunctionType type) {
       assert(!(method is MethodElement && !method.isImplementation));
       jsAst.Expression thisAccess = new jsAst.This();
       if (!method.isAbstract) {
         ClosureRepresentationInfo closureData =
-            _closureDataLookup.getClosureRepresentationInfo(method);
+            _closureDataLookup.getClosureInfoForMember(method);
         if (closureData != null) {
           ClosureFieldElement thisLocal = closureData.thisFieldEntity;
           if (thisLocal != null) {
             jsAst.Name thisName = _namer.instanceFieldPropertyName(thisLocal);
             thisAccess = js('this.#', thisName);
           }
         }
       }
 
       if (storeFunctionTypeInMetadata && !type.containsTypeVariables) {
@@ skipping 200 matching lines @@
 
     // We need to also emit "is checks" for the superclass and its supertypes.
     ClassEntity superclass = _elementEnvironment.getSuperClass(cls);
     if (superclass != null) {
       tryEmitTest(superclass);
       _generateInterfacesIsTests(
           superclass, generateIsTest, generateSubstitution, alreadyGenerated);
     }
   }
 }