Handle deferred access as pre-step in SemanticSendVisitor.

pkg/compiler/lib/src/resolution/semantic_visitor_mixins.dart

Index: pkg/compiler/lib/src/resolution/semantic_visitor_mixins.dart
diff --git a/pkg/compiler/lib/src/resolution/semantic_visitor_mixins.dart b/pkg/compiler/lib/src/resolution/semantic_visitor_mixins.dart
index f3660527b5c0df85480a2d9ae2ff35df64e889fd..bdce7698c2412f727ecc8044a91b9c919fb1f852 100644
--- a/pkg/compiler/lib/src/resolution/semantic_visitor_mixins.dart
+++ b/pkg/compiler/lib/src/resolution/semantic_visitor_mixins.dart
@@ -2478,6 +2478,14 @@ abstract class BaseBulkMixin<R, A>
       A arg) {
     return bulkHandleNode(node, 'Lazy or `#` unhandled.', arg);
   }
+
+  @override
+  void visitDeferredAccess(
+      Send node,
+      PrefixElement prefix,
+      A arg) {
+    bulkHandleNode(node, 'Deferred access `#` unhandled.', arg);
+  }
 }
 
 /// Mixin that implements all visitor methods for `super` calls in
@@ -3510,6 +3518,13 @@ class TraversalSendMixin<R, A> implements SemanticSendVisitor<R, A> {
   }
 
   @override
+  void visitDeferredAccess(
+      Send node,
+      PrefixElement prefix,
+      A arg) {
+  }
+
+  @override
   R errorInvalidAssert(
       Send node,
       NodeList arguments,