Introduce ClassLike, MemberLike, FieldLike and FunctionLike

pkg/compiler/lib/src/ssa/codegen_helpers.dart

 // Copyright (c) 2012, 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.
 
 import '../compiler.dart' show Compiler;
 import '../constants/values.dart';
 import '../elements/elements.dart';
 import '../js_backend/js_backend.dart';
 import '../types/types.dart';
 import '../universe/selector.dart' show Selector;
@@ skipping 401 matching lines @@
         .isNotEmpty;
   }
 
   void visitInstruction(HInstruction instruction) {
     // A code motion invariant instruction is dealt before visiting it.
     assert(!instruction.isCodeMotionInvariant());
     analyzeInputs(instruction, 0);
   }
 
   void visitInvokeSuper(HInvokeSuper instruction) {
-    Element superMethod = instruction.element;
+    MemberElement superMethod = instruction.element;
     Selector selector = instruction.selector;
     // If aliased super members cannot be used, we will generate code like
     //
     //     C.prototype.method.call(instance)
     //
     // where instance is the [this] object for the method. In such a case, the
     // get of prototype might be evaluated before instance is created if we
     // generate instance at use site, which in turn might update the prototype
     // after first access if we use lazy initialization.
     // In this case, we therefore don't allow the receiver (the first argument)
@@ skipping 355 matching lines @@
     }
 
     // If [thenInput] is defined in the first predecessor, then it is only used
     // by [phi] and can be generated at use site.
     if (identical(thenInput.block, end.predecessors[0])) {
       assert(thenInput.usedBy.length == 1);
       markAsGenerateAtUseSite(thenInput);
     }
   }
 }