Don't resolve FieldFormalParameter field if not in constructor.

pkg/analyzer/test/src/summary/resynthesize_common.dart

Index: pkg/analyzer/test/src/summary/resynthesize_common.dart
diff --git a/pkg/analyzer/test/src/summary/resynthesize_common.dart b/pkg/analyzer/test/src/summary/resynthesize_common.dart
index 87aa32367ec754e301bddf9cf6df5a8355914c65..a5079c0c2fea54126457400166a78fb07bcdf7ad 100644
--- a/pkg/analyzer/test/src/summary/resynthesize_common.dart
+++ b/pkg/analyzer/test/src/summary/resynthesize_common.dart
@@ -3909,6 +3909,14 @@ class C {
 ''');
   }
 
+  test_invalid_setterParameter_fieldFormalParameter_self() {
+    checkLibrary('''
+class C {
+  set x(this.x) {}
+}
+''');
+  }
+
   test_library() {
     checkLibrary('');
   }