Add support for converted closures with explicit contexts to VM

pkg/kernel/lib/transformations/closure/converter.dart

Index: pkg/kernel/lib/transformations/closure/converter.dart
diff --git a/pkg/kernel/lib/transformations/closure/converter.dart b/pkg/kernel/lib/transformations/closure/converter.dart
index b4edd6df9e61333a438ca0c26d84a3f0bd8d9fbf..570f4776ea2fbbd942859d44b08ab1319941dce2 100644
--- a/pkg/kernel/lib/transformations/closure/converter.dart
+++ b/pkg/kernel/lib/transformations/closure/converter.dart
@@ -232,6 +232,7 @@ class ClosureConverter extends Transformer {
       }
     }
     rewriter = null;
+    context = null;
     // Transform constructor body.
     FunctionNode function = node.function;
     if (function.body != null && function.body is! EmptyStatement) {
@@ -644,9 +645,8 @@ class ClosureConverter extends Transformer {
   TreeNode visitPropertyGet(PropertyGet node) {
     Name tearOffName = tearOffGetterNames[node.name];
     if (tearOffName != null) {
-      MethodInvocation replacement = new MethodInvocation(
-          node.receiver, tearOffName, new Arguments(<Expression>[]));
-      return super.visitMethodInvocation(replacement);
+      PropertyGet replacement = new PropertyGet(node.receiver, tearOffName);
+      return super.visitPropertyGet(replacement);
     }
     return super.visitPropertyGet(node);
   }