Store pointer instead of reference to LocalVariable in ast and flow graph.

runtime/vm/ast_test.cc

 // 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.
 
 #include "platform/assert.h"
 #include "vm/ast.h"
 #include "vm/heap.h"
 #include "vm/isolate.h"
 #include "vm/object.h"
 #include "vm/object_store.h"
 #include "vm/unit_test.h"
 
 namespace dart {
 
 TEST_CASE(Ast) {
   LocalVariable* v = new LocalVariable(Scanner::kDummyTokenIndex,
                                        String::ZoneHandle(String::New("v")),
                                        Type::ZoneHandle(Type::DynamicType()));
-  AstNode* ll = new LoadLocalNode(Scanner::kDummyTokenIndex, *v);
+  AstNode* ll = new LoadLocalNode(Scanner::kDummyTokenIndex, v);
   EXPECT(ll->IsLoadLocalNode());
   EXPECT(!ll->IsLiteralNode());
   LoadLocalNode* lln = ll->AsLoadLocalNode();
   EXPECT(NULL != lln);
   v->set_index(1);
   EXPECT_EQ(1, v->index());
 
   LocalVariable* p = new LocalVariable(Scanner::kDummyTokenIndex,
                                        String::ZoneHandle(String::New("p")),
                                        Type::ZoneHandle(Type::DynamicType()));
@@ skipping 23 matching lines @@
   SequenceNode* sequence_node = new SequenceNode(1, new LocalScope(NULL, 0, 0));
   LiteralNode* literal_node = new LiteralNode(2,  Smi::ZoneHandle(Smi::New(3)));
   ReturnNode* return_node = new ReturnNode(3, literal_node);
   sequence_node->Add(return_node);
   GrowableArray<AstNode*> nodes;
   sequence_node->CollectAllNodes(&nodes);
   EXPECT_EQ(3, nodes.length());
 }
 
 }  // namespace dart