Switch on null-aware operators by default in analyzer.

pkg/analyzer/test/generated/resolver_test.dart

Index: pkg/analyzer/test/generated/resolver_test.dart
diff --git a/pkg/analyzer/test/generated/resolver_test.dart b/pkg/analyzer/test/generated/resolver_test.dart
index 1e17493b10f2b5479107a57cfdc4d74720864440..89242b9e91d9a690a1eec2bb3271774c0dffbfc9 100644
--- a/pkg/analyzer/test/generated/resolver_test.dart
+++ b/pkg/analyzer/test/generated/resolver_test.dart
@@ -399,8 +399,6 @@ class AnalysisContextForTests extends AnalysisContextImpl {
         currentOptions.dart2jsHint != options.dart2jsHint ||
         (currentOptions.hint && !options.hint) ||
         currentOptions.preserveComments != options.preserveComments ||
-        currentOptions.enableNullAwareOperators !=
-            options.enableNullAwareOperators ||
         currentOptions.enableStrictCallChecks != options.enableStrictCallChecks;
     if (needsRecompute) {
       fail(
@@ -6414,8 +6412,6 @@ class NewAnalysisContextForTests extends newContext.AnalysisContextImpl {
         currentOptions.dart2jsHint != options.dart2jsHint ||
         (currentOptions.hint && !options.hint) ||
         currentOptions.preserveComments != options.preserveComments ||
-        currentOptions.enableNullAwareOperators !=
-            options.enableNullAwareOperators ||
         currentOptions.enableStrictCallChecks != options.enableStrictCallChecks;
     if (needsRecompute) {
       fail(