Split getClosureRepresentationInfo into MemberEntity and (ir/ast) nodes

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

Index: pkg/compiler/lib/src/ssa/kernel_ast_adapter.dart
diff --git a/pkg/compiler/lib/src/ssa/kernel_ast_adapter.dart b/pkg/compiler/lib/src/ssa/kernel_ast_adapter.dart
index 5f2bb0357974d4b26a58541b5f5967c38489c53d..c6e14f3103591995b0212630b497131d962ae64c 100644
--- a/pkg/compiler/lib/src/ssa/kernel_ast_adapter.dart
+++ b/pkg/compiler/lib/src/ssa/kernel_ast_adapter.dart
@@ -136,7 +136,7 @@ class KernelAstAdapter extends KernelToElementMapBaseMixin
         MethodElement originTargetFunction = originTarget;
         ClosureRepresentationInfo classMap = _compiler
             .backendStrategy.closureDataLookup
-            .getClosureRepresentationInfo(originTargetFunction);
+            .getClosureInfoForMember(originTargetFunction);
         if (classMap.closureEntity != null) {
           target = kernel.localFunctions[classMap.closureEntity];
         }
@@ -399,6 +399,13 @@ class KernelAstAdapter extends KernelToElementMapBaseMixin
       ClosureDataLookup closureLookup, ir.TreeNode node) {
     return closureLookup.getCapturedLoopScope(getNode(node));
   }
+
+  @override
+  ClosureRepresentationInfo getClosureRepresentationInfo(
+      ClosureDataLookup closureLookup, ir.TreeNode node) {
+    LocalFunctionElement localFunction = getElement(node);
+    return closureLookup.getClosureInfo(localFunction.node);
+  }
 }
 
 /// Visitor that converts kernel dart types into [ResolutionDartType].