Move all flags to CompilerOptions (first step to stop passing the compiler to

pkg/compiler/lib/src/deferred_load.dart

 // Copyright (c) 2014, the Dart project authors.  Please see the AUTHORS file
 // for details. All rights reserved. Use of this source code is governed by a
 // BSD-style license that can be found in the LICENSE file.
 
 library deferred_load;
 
 import 'common.dart';
 import 'common/backend_api.dart' show
     Backend;
 import 'common/tasks.dart' show
@@ skipping 328 matching lines @@
                         elements.add(type.element);
                       }
                       break;
                     case TypeUseKind.INSTANTIATION:
                     case TypeUseKind.IS_CHECK:
                     case TypeUseKind.AS_CAST:
                     case TypeUseKind.CATCH_TYPE:
                       collectTypeDependencies(type);
                       break;
                     case TypeUseKind.CHECKED_MODE_CHECK:
-                      if (compiler.enableTypeAssertions) {
+                      if (compiler.options.enableTypeAssertions) {
                         collectTypeDependencies(type);
                       }
                       break;
                   }
                 }),
              IMPACT_USE);
 
         TreeElements treeElements = analyzableElement.resolvedAst.elements;
         assert(treeElements != null);
 
@@ skipping 652 matching lines @@
     return result;
   }
 
   bool operator ==(other) {
     if (other is! _DeclaredDeferredImport) return false;
     return declaration == other.declaration;
   }
 
   int get hashCode => declaration.hashCode * 17;
 }