Split getClosureRepresentationInfo into MemberEntity and (ir/ast) nodes

pkg/compiler/lib/src/inferrer/builder_kernel.dart

 // Copyright (c) 2017, 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:kernel/ast.dart' as ir;
 
 import '../closure.dart';
 import '../compiler.dart';
 import '../elements/elements.dart';
 import '../elements/entities.dart';
@@ skipping 88 matching lines @@
         return types.nullType;
       }
     }
 
     // Update the locals that are boxed in [locals]. These locals will
     // be handled specially, in that we are computing their LUB at
     // each update, and reading them yields the type that was found in a
     // previous analysis of [outermostElement].
     ClosureRepresentationInfo closureData = compiler
         .backendStrategy.closureDataLookup
-        .getClosureRepresentationInfo(resolvedAst.element);
+        .getClosureInfoForMember(outermostElement);
     closureData.forEachCapturedVariable((variable, field) {
       locals.setCaptured(variable, field);
     });
     closureData.forEachBoxedVariable((variable, field) {
       locals.setCapturedAndBoxed(variable, field);
     });
 
     if (analyzedNode is ir.Field) {
       return initializer.accept(this);
     }
@@ skipping 44 matching lines @@
           : types.simplifyPhi(null, null, elementType);
       TypeInformation containerType =
           listLiteral.isConst ? types.constListType : types.growableListType;
       // TODO(efortuna): Change signature of allocateList and the rest of
       // type_system to deal with Kernel elements.
       return types.allocateList(containerType, astAdapter.getNode(listLiteral),
           outermostElement, elementType, length);
     });
   }
 }