anchor.diff:  
   abstract class VMKernelCompilerMixin {
     TestConfiguration get _configuration;
  +
     bool get _useSdk;
  +
     bool get _isAot;
  +
     bool get _isChecked;
  +
     bool get _useEnableAsserts;
   
     String get executableScriptSuffix;
  
positive.code:   final bool previewDart2;
  
    bool get _isAndroid => _configuration.system == System.android;
    bool get _isArm => _configuration.architecture == Architecture.arm;
    bool get _isArm64 => _configuration.architecture == Architecture.arm64;
  
    bool get _isAot => true;
  
negative.code:   }
  
    List<String> computeCompilerArguments(
        List<String> vmOptions,
        List<String> sharedOptions,
        List<String> dart2jsOptions,
        List<String> ddcOptions,
        List<String> originalArguments) {
      List<String> args = [];
      if (_isChecked) {
        args.add('--enable_asserts');
  