Split getClosureRepresentationInfo into MemberEntity and (ir/ast) nodes

pkg/compiler/lib/src/dump_info.dart

Index: pkg/compiler/lib/src/dump_info.dart
diff --git a/pkg/compiler/lib/src/dump_info.dart b/pkg/compiler/lib/src/dump_info.dart
index f89bec3c3f0693f593298104b55efdd1fbaa4200..cc292e4c55b0af777267c083f3248985a609e0ed 100644
--- a/pkg/compiler/lib/src/dump_info.dart
+++ b/pkg/compiler/lib/src/dump_info.dart
@@ -211,9 +211,8 @@ class ElementInfoCollector extends BaseElementVisitor<Info, dynamic> {
         size: compiler.dumpInfoTask.sizeOf(element));
     _elementToInfo[element] = closureInfo;
 
-    ClosureRepresentationInfo closureRepresentation = compiler
-        .backendStrategy.closureDataLookup
-        .getClosureRepresentationInfo(element.methodElement);
+    ClosureRepresentationInfo closureRepresentation =
+        compiler.backendStrategy.closureDataLookup.getClosureInfo(element.node);
     assert(closureRepresentation.closureClassEntity == element);
 
     FunctionInfo functionInfo = this.process(closureRepresentation.callMethod);