Revert 17963, 17962 and 17955: Random number generator in JS changes

src/heap.cc

 // Copyright 2012 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 1747 matching lines @@
 
     if (record_slots) {
       // Record the updated slot if necessary.
       Object** head_slot = HeapObject::RawField(
           context, FixedArray::SizeFor(index));
       heap->mark_compact_collector()->RecordSlot(
           head_slot, head_slot, list_head);
     }
   }
 
-  static void VisitPhantomObject(Heap*, Context* context) {
-    // A bit of a hack, see the comment at the end of Genesis::Genesis().
-    delete[] reinterpret_cast<uint32_t*>(context->random_state());
+  static void VisitPhantomObject(Heap*, Context*) {
   }
 
   static int WeakNextOffset() {
     return FixedArray::SizeFor(Context::NEXT_CONTEXT_LINK);
   }
 };
 
 
 void Heap::ProcessWeakReferences(WeakObjectRetainer* retainer) {
   // We don't record weak slots during marking or scavenges.
@@ skipping 6176 matching lines @@
       static_cast<int>(object_sizes_last_time_[index]));
   CODE_AGE_LIST_COMPLETE(ADJUST_LAST_TIME_OBJECT_COUNT)
 #undef ADJUST_LAST_TIME_OBJECT_COUNT
 
   OS::MemCopy(object_counts_last_time_, object_counts_, sizeof(object_counts_));
   OS::MemCopy(object_sizes_last_time_, object_sizes_, sizeof(object_sizes_));
   ClearObjectStats();
 }
 
 } }  // namespace v8::internal