Fix static modifier for synthetic fields coming from summaries.

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 5f1f61958f6a425ab47b32e094054fcbc7f77e64..bf040c6ea0b03e155d0b2a3491260bc5604495e1 100644
--- a/pkg/analyzer/test/src/summary/resynthesize_common.dart
+++ b/pkg/analyzer/test/src/summary/resynthesize_common.dart
@@ -1259,6 +1259,8 @@ abstract class AbstractResynthesizeTest extends AbstractSingleUnitTest {
     } else if (modifier == Modifier.STATIC) {
       if (element is ExecutableElement) {
         return element.isStatic;
+      } else if (element is FieldElement) {
+        return element.isStatic;
       }
       return false;
     } else if (modifier == Modifier.SYNTHETIC) {