Resynthesize field formal parameters from Kernel.

pkg/analyzer/test/src/context/mock_sdk.dart

Index: pkg/analyzer/test/src/context/mock_sdk.dart
diff --git a/pkg/analyzer/test/src/context/mock_sdk.dart b/pkg/analyzer/test/src/context/mock_sdk.dart
index e5e00510ca4ac58ab2659df0c337d91ff29f6f99..0023832cf6e225b5144c9e19cee1bf83a8c3c127 100644
--- a/pkg/analyzer/test/src/context/mock_sdk.dart
+++ b/pkg/analyzer/test/src/context/mock_sdk.dart
@@ -303,6 +303,15 @@ const Object proxy = const _Proxy();
 
 class _Override { const _Override(); }
 const Object override = const _Override();
+
+class _CompileTimeError {
+  final String _errorMsg;
+  _CompileTimeError(this._errorMsg);
+}
+
+class _ConstantExpressionError {
+  const _ConstantExpressionError();
+}
 ''');
 
 const _MockSdkLibrary _LIB_FOREIGN_HELPER = const _MockSdkLibrary(