Handle deferred access as pre-step in SemanticSendVisitor.

tests/compiler/dart2js/semantic_visitor_test_send_data.dart

 // Copyright (c) 2015, the Dart project authors.  Please see the AUTHORS file
 // for details. All rights reserved. Use of this source code is governed by a
 // BSD-style license that can be found in the LICENSE file.
 
 part of dart2js.semantics_visitor_test;
 
 const Map<String, List<Test>> SEND_TESTS = const {
   'Parameters': const [
     // Parameters
     const Test('m(o) => o;',
@@ skipping 89 matching lines @@
                     element: 'field(C#o)')),
     const Test.prefix(
         '''
         class C {
           static var o;
         }
         ''',
         'm() => p.C.o;',
         const Visit(VisitKind.VISIT_STATIC_FIELD_GET,
                     element: 'field(C#o)')),
+    const Test.prefix(
+        '''
+        class C {
+          static var o;
+        }
+        ''',
+        'm() => p.C.o;',
+        const [
+          const Visit(VisitKind.PREVISIT_DEFERRED_ACCESS,
+                      element: 'prefix(p)'),
+          const Visit(VisitKind.VISIT_STATIC_FIELD_GET,
+                      element: 'field(C#o)'),
+        ],
+        isDeferred: true),
     const Test(
         '''
         class C {
           var o;
         }
         m() => C.o;
         ''',
         const Visit(VisitKind.VISIT_UNRESOLVED_GET,
                     name: 'o')),
     const Test(
         '''
         class C {
           C.o();
         }
         m() => C.o;
         ''',
         const Visit(VisitKind.VISIT_UNRESOLVED_GET,
                     name: 'o')),
+    const Test.prefix(
+        '''
+        ''',
+        'm() => p.C.o;',
+        const [
+          const Visit(VisitKind.VISIT_DYNAMIC_PROPERTY_GET,
+                      receiver: 'p.C', name: 'o'),
+          const Visit(VisitKind.VISIT_UNRESOLVED_GET, name: 'C'),
+        ]),
+    const Test.prefix(
+        '''
+        class C {
+        }
+        ''',
+        'm() => p.C.o;',
+        const Visit(VisitKind.VISIT_UNRESOLVED_GET, name: 'o')),
+    const Test.prefix(
+        '''
+        ''',
+        'm() => p.C.o;',
+        const [
+          const Visit(VisitKind.VISIT_DYNAMIC_PROPERTY_GET,
+                      receiver: 'p.C', name: 'o'),
+          const Visit(VisitKind.PREVISIT_DEFERRED_ACCESS,
+                      element: 'prefix(p)'),
+          const Visit(VisitKind.VISIT_UNRESOLVED_GET,
+                      name: 'C'),
+        ],
+        isDeferred: true),
+    const Test.prefix(
+        '''
+        class C {
+        }
+        ''',
+        'm() => p.C.o;',
+        const [
+          const Visit(VisitKind.PREVISIT_DEFERRED_ACCESS,
+                      element: 'prefix(p)'),
+          const Visit(VisitKind.VISIT_UNRESOLVED_GET,
+                      name: 'o'),
+        ],
+        isDeferred: true),
     const Test(
         '''
         class C {}
         m() => C.this;
         ''',
         null),
     const Test(
         '''
         class C { static var o; }
         m() { C.o = 42; }
@@ skipping 514 matching lines @@
         ''',
         const Visit(VisitKind.VISIT_TOP_LEVEL_FIELD_GET,
                     element: 'field(o)')),
     const Test.prefix(
         '''
         var o;
         ''',
         'm() => p.o;',
         const Visit(VisitKind.VISIT_TOP_LEVEL_FIELD_GET,
                     element: 'field(o)')),
+    const Test.prefix(
+        '''
+        var o;
+        ''',
+        'm() => p.o;',
+        const [
+          const Visit(VisitKind.PREVISIT_DEFERRED_ACCESS,
+                      element: 'prefix(p)'),
+          const Visit(VisitKind.VISIT_TOP_LEVEL_FIELD_GET,
+                      element: 'field(o)'),
+        ],
+        isDeferred: true),
+    const Test.prefix(
+        '''
+        ''',
+        'm() => p.o;',
+        const Visit(VisitKind.VISIT_UNRESOLVED_GET,
+                    name: 'o')),
+    const Test.prefix(
+        '''
+        ''',
+        'm() => p.o;',
+        const [
+          const Visit(VisitKind.PREVISIT_DEFERRED_ACCESS,
+                      element: 'prefix(p)'),
+          const Visit(VisitKind.VISIT_UNRESOLVED_GET,
+                      name: 'o'),
+        ],
+        isDeferred: true),
     const Test(
         '''
         var o;
         m() { o = 42; }
         ''',
         const Visit(VisitKind.VISIT_TOP_LEVEL_FIELD_SET,
                     element: 'field(o)',
                     rhs: '42')),
     const Test.prefix(
         '''
@@ skipping 2884 matching lines @@
         '''
         m(a) => a ??= 42;
         ''',
         const Visit(
             VisitKind.VISIT_PARAMETER_COMPOUND,
             element: 'parameter(m#a)',
             operator: '??=',
             rhs: '42')),
   ],
 };