Implement Math.random() purely in JavaScript.

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*) {
+  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 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 6179 matching lines @@
   if (FLAG_concurrent_recompilation) {
     heap_->relocation_mutex_->Lock();
 #ifdef DEBUG
     heap_->relocation_mutex_locked_by_optimizer_thread_ =
         heap_->isolate()->optimizing_compiler_thread()->IsOptimizerThread();
 #endif  // DEBUG
   }
 }
 
 } }  // namespace v8::internal