Unbind canonical name of getter after renaming it in closure conversion

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..ecf7efbd8e1c4cf59dfb0a3d6160356678d8f93f 100644
--- a/pkg/kernel/lib/transformations/closure/converter.dart
+++ b/pkg/kernel/lib/transformations/closure/converter.dart
@@ -416,6 +416,7 @@ class ClosureConverter extends Transformer {
           // We rename the getter to avoid an indirection in most cases.
           Name oldName = node.name;
           node.name = tearOffName;
+          node.reference.canonicalName.unbind();
           addGetterForwarder(oldName, node);
         } else if (node.kind == ProcedureKind.Method) {
           addTearOffMethod(tearOffName, node);