fixes #25793, make strong checker tests sane

pkg/analyzer/lib/src/task/dart.dart

Index: pkg/analyzer/lib/src/task/dart.dart
diff --git a/pkg/analyzer/lib/src/task/dart.dart b/pkg/analyzer/lib/src/task/dart.dart
index b492bb27099edb2fab00b89fc1417c2ded4233c1..de066515d9dad06cb56bedda40f63bf4728355c3 100644
--- a/pkg/analyzer/lib/src/task/dart.dart
+++ b/pkg/analyzer/lib/src/task/dart.dart
@@ -5113,9 +5113,11 @@ class StrongModeVerifyUnitTask extends SourceBasedAnalysisTask {
     //
     TypeProvider typeProvider = getRequiredInput(TYPE_PROVIDER_INPUT);
     CompilationUnit unit = getRequiredInput(UNIT_INPUT);
-    if (context.analysisOptions.strongMode) {
+    AnalysisOptionsImpl options = context.analysisOptions;
+    if (options.strongMode) {
       unit.accept(new CodeChecker(
-          typeProvider, new StrongTypeSystemImpl(), errorListener));
+          typeProvider, new StrongTypeSystemImpl(), errorListener,
+          hints: options.strongModeHints));
     }
     //
     // Record outputs.