Remove variable rewrites and the unneccesary Slot class.

src/liveedit.cc

 // Copyright 2011 the V8 project authors. All rights reserved.
 // Redistribution and use in source and binary forms, with or without
 // modification, are permitted provided that the following conditions are
 // met:
 //
 //     * Redistributions of source code must retain the above copyright
 //       notice, this list of conditions and the following disclaimer.
 //     * Redistributions in binary form must reproduce the above
 //       copyright notice, this list of conditions and the following
 //       disclaimer in the documentation and/or other materials provided
@@ skipping 842 matching lines @@
     Scope* outer_scope = scope->outer_scope();
     if (outer_scope == NULL) {
       return HEAP->undefined_value();
     }
     do {
       ZoneList<Variable*> list(10);
       outer_scope->CollectUsedVariables(&list);
       int j = 0;
       for (int i = 0; i < list.length(); i++) {
         Variable* var1 = list[i];
-        Slot* slot = var1->AsSlot();
-        if (slot != NULL && slot->type() == Slot::CONTEXT) {
+        if (var1->IsContextSlot()) {
           if (j != i) {
             list[j] = var1;
           }
           j++;
         }
       }
 
       // Sort it.
       for (int k = 1; k < j; k++) {
         int l = k;
         for (int m = k + 1; m < j; m++) {
-          if (list[l]->AsSlot()->index() > list[m]->AsSlot()->index()) {
+          if (list[l]->index() > list[m]->index()) {
             l = m;
           }
         }
         list[k] = list[l];
       }
       for (int i = 0; i < j; i++) {
         SetElementNonStrict(scope_info_list,
                             scope_info_length,
                             list[i]->name());
         scope_info_length++;
         SetElementNonStrict(
             scope_info_list,
             scope_info_length,
-            Handle<Smi>(Smi::FromInt(list[i]->AsSlot()->index())));
+            Handle<Smi>(Smi::FromInt(list[i]->index())));
         scope_info_length++;
       }
       SetElementNonStrict(scope_info_list,
                           scope_info_length,
                           Handle<Object>(HEAP->null_value()));
       scope_info_length++;
 
       outer_scope = outer_scope->outer_scope();
     } while (outer_scope != NULL);
 
@@ skipping 877 matching lines @@
 
 bool LiveEditFunctionTracker::IsActive(Isolate* isolate) {
   return false;
 }
 
 #endif  // ENABLE_DEBUGGER_SUPPORT
 
 
 
 } }  // namespace v8::internal