Add analysis option that will be used to fix #26583

pkg/analyzer/lib/src/context/context.dart

Index: pkg/analyzer/lib/src/context/context.dart
diff --git a/pkg/analyzer/lib/src/context/context.dart b/pkg/analyzer/lib/src/context/context.dart
index ce82af684c8aeb2b52a458723b373ae44c4f61fc..1cc85bc78fb68f3fefd6e2955af936555a2cb5d0 100644
--- a/pkg/analyzer/lib/src/context/context.dart
+++ b/pkg/analyzer/lib/src/context/context.dart
@@ -271,6 +271,9 @@ class AnalysisContextImpl implements InternalAnalysisContext {
         ((options is AnalysisOptionsImpl)
             ? this._options.strongModeHints != options.strongModeHints
             : false) ||
+        ((options is AnalysisOptionsImpl)
+            ? this._options.implicitCasts != options.implicitCasts
+            : false) ||
         this._options.enableStrictCallChecks !=
             options.enableStrictCallChecks ||
         this._options.enableGenericMethods != options.enableGenericMethods ||
@@ -301,6 +304,7 @@ class AnalysisContextImpl implements InternalAnalysisContext {
     this._options.trackCacheDependencies = options.trackCacheDependencies;
     if (options is AnalysisOptionsImpl) {
       this._options.strongModeHints = options.strongModeHints;
+      this._options.implicitCasts = options.implicitCasts;
     }
     if (needsRecompute) {
       for (WorkManager workManager in workManagers) {