Store the covariant keyword flag for parameters and fields into Kernel and resynthesize in analyzer.

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

Index: pkg/analyzer/test/src/summary/resynthesize_kernel_test.dart
diff --git a/pkg/analyzer/test/src/summary/resynthesize_kernel_test.dart b/pkg/analyzer/test/src/summary/resynthesize_kernel_test.dart
index 22702441f570d65be0c9769c2426bb545f8f5412..5dfbf2880c6b48ebf1ed4c021ffd01ae3c2d8f1b 100644
--- a/pkg/analyzer/test/src/summary/resynthesize_kernel_test.dart
+++ b/pkg/analyzer/test/src/summary/resynthesize_kernel_test.dart
@@ -386,11 +386,6 @@ class ResynthesizeKernelStrongTest extends ResynthesizeTest {
     await super.test_exportImport_configurations_useFirst();
   }
 
-  @failingTest
-  test_field_covariant() async {
-    await super.test_field_covariant();
-  }
-
   @failingTest
   test_field_propagatedType_final_dep_inLib() async {
     await super.test_field_propagatedType_final_dep_inLib();
@@ -668,11 +663,6 @@ class ResynthesizeKernelStrongTest extends ResynthesizeTest {
     await super.test_parameter_checked_inherited();
   }
 
-  @failingTest
-  test_parameter_covariant() async {
-    await super.test_parameter_covariant();
-  }
-
   @failingTest
   test_parameter_covariant_inherited() async {
     await super.test_parameter_covariant_inherited();
@@ -688,11 +678,6 @@ class ResynthesizeKernelStrongTest extends ResynthesizeTest {
     await super.test_parts_invalidUri_nullStringValue();
   }
 
-  @failingTest
-  test_setter_covariant() async {
-    await super.test_setter_covariant();
-  }
-
   @failingTest
   test_syntheticFunctionType_genericClosure() async {
     await super.test_syntheticFunctionType_genericClosure();