[kernel] Don't use kernel ast nodes as keys

runtime/vm/kernel.h

 // Copyright (c) 2016, 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.
 
 #ifndef RUNTIME_VM_KERNEL_H_
 #define RUNTIME_VM_KERNEL_H_
 
 #if !defined(DART_PRECOMPILED_RUNTIME)
 #include "platform/assert.h"
 #include "vm/allocation.h"
@@ skipping 417 matching lines @@
 
 
 class TreeNode : public Node {
  public:
   virtual ~TreeNode();
 
   DEFINE_CASTING_OPERATIONS(TreeNode);
 
   virtual void AcceptVisitor(Visitor* visitor);
   virtual void AcceptTreeVisitor(TreeVisitor* visitor) = 0;
+  intptr_t kernel_offset() { return kernel_offset_; }
 
  protected:
-  TreeNode() {}
+  TreeNode() : kernel_offset_(-1) {}
+
+  // Offset for this node in the kernel-binary. If this node has a tag the
+  // offset includes the tag. Can be -1 to indicate "unknown" or invalid offset.
+  intptr_t kernel_offset_;
 
  private:
   DISALLOW_COPY_AND_ASSIGN(TreeNode);
 };
 
 
 class LinkedNode : public TreeNode {
  public:
   virtual ~LinkedNode();
 
@@ skipping 1997 matching lines @@
 
 
 class VariableDeclaration : public Statement {
  public:
   enum Flags {
     kFlagFinal = 1 << 0,
     kFlagConst = 1 << 1,
   };
 
   static VariableDeclaration* ReadFrom(Reader* reader);
-  static VariableDeclaration* ReadFromImpl(Reader* reader);
+  static VariableDeclaration* ReadFromImpl(Reader* reader, bool read_tag);
 
   virtual ~VariableDeclaration();
 
   DEFINE_CASTING_OPERATIONS(VariableDeclaration);
 
   virtual void AcceptStatementVisitor(StatementVisitor* visitor);
   virtual void VisitChildren(Visitor* visitor);
 
   bool IsConst() { return (flags_ & kFlagConst) == kFlagConst; }
   bool IsFinal() { return (flags_ & kFlagFinal) == kFlagFinal; }
@@ skipping 774 matching lines @@
 
 kernel::Program* ReadPrecompiledKernelFromBuffer(const uint8_t* buffer,
                                                  intptr_t buffer_length);
 
 
 
 }  // namespace dart
 
 #endif  // !defined(DART_PRECOMPILED_RUNTIME)
 #endif  // RUNTIME_VM_KERNEL_H_