Set 'isSyntheticDefault' for default constructors.

pkg/front_end/testcases/inference/infer_field_overrides_setter.dart.strong.expect

Index: pkg/front_end/testcases/inference/infer_field_overrides_setter.dart.strong.expect
diff --git a/pkg/front_end/testcases/inference/infer_field_overrides_setter.dart.strong.expect b/pkg/front_end/testcases/inference/infer_field_overrides_setter.dart.strong.expect
index ad8c22fea0e2e2d6972cd38554d86475f4367c8c..0d117a70880b4daa0f6471c87981460729035f7f 100644
--- a/pkg/front_end/testcases/inference/infer_field_overrides_setter.dart.strong.expect
+++ b/pkg/front_end/testcases/inference/infer_field_overrides_setter.dart.strong.expect
@@ -3,38 +3,38 @@ import self as self;
 import "dart:core" as core;
 
 abstract class A extends core::Object {
-  constructor •() → void
+  default constructor •() → void
     : super core::Object::•()
     ;
   abstract set x(core::int value) → void;
 }
 class B extends core::Object {
-  constructor •() → void
+  default constructor •() → void
     : super core::Object::•()
     ;
   set x(core::int value) → void {}
 }
 class C extends self::A {
   field core::int x = null;
-  constructor •() → void
+  default constructor •() → void
     : super self::A::•()
     ;
 }
 class D extends self::B {
   field core::int x = null;
-  constructor •() → void
+  default constructor •() → void
     : super self::B::•()
     ;
 }
 class E extends core::Object implements self::A {
   field core::int x = null;
-  constructor •() → void
+  default constructor •() → void
     : super core::Object::•()
     ;
 }
 class F extends core::Object implements self::B {
   field core::int x = null;
-  constructor •() → void
+  default constructor •() → void
     : super core::Object::•()
     ;
 }
@@ -42,7 +42,7 @@ abstract class Object&B = core::Object with self::B {
 }
 class G extends self::Object&B {
   field core::int x = null;
-  constructor •() → void
+  default constructor •() → void
     : super core::Object::•()
     ;
 }