CLI support for `enableAssertInitializer`s.

pkg/analyzer_cli/lib/src/driver.dart

Index: pkg/analyzer_cli/lib/src/driver.dart
diff --git a/pkg/analyzer_cli/lib/src/driver.dart b/pkg/analyzer_cli/lib/src/driver.dart
index 6c3c6ddbc968b1d052bce8a738f7767d30e87348..cb562d0eb24ff51a1b9fcad4828cdab121f60fbc 100644
--- a/pkg/analyzer_cli/lib/src/driver.dart
+++ b/pkg/analyzer_cli/lib/src/driver.dart
@@ -319,6 +319,10 @@ class Driver implements CommandLineStarter {
         _previousOptions.enableStrictCallChecks) {
       return false;
     }
+    if (options.enableAssertInitializer !=
+        _previousOptions.enableAssertInitializer) {
+      return false;
+    }
     if (options.showPackageWarnings != _previousOptions.showPackageWarnings) {
       return false;
     }
@@ -764,6 +768,7 @@ class Driver implements CommandLineStarter {
     contextOptions.hint = !options.disableHints;
     contextOptions.generateImplicitErrors = options.showPackageWarnings;
     contextOptions.generateSdkErrors = options.showSdkWarnings;
+    contextOptions.enableAssertInitializer = options.enableAssertInitializer;
 
     return contextOptions;
   }