Fix issues with compiling V8 with LLVM Clang...

src/debug.cc

 // Copyright 2006-2008 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 785 matching lines @@
 
 
 // Set the flag indicating that preemption happened during debugging.
 void Debug::PreemptionWhileInDebugger() {
   ASSERT(InDebugger());
   Debug::set_interrupts_pending(PREEMPT);
 }
 
 
 void Debug::Iterate(ObjectVisitor* v) {
-  v->VisitPointer(bit_cast<Object**, Code**>(&(debug_break_return_)));
+  v->VisitPointer(BitCast<Object**, Code**>(&(debug_break_return_)));
 }
 
 
 Object* Debug::Break(Arguments args) {
   HandleScope scope;
   ASSERT(args.length() == 0);
 
   // Get the top-most JavaScript frame.
   JavaScriptFrameIterator it;
   JavaScriptFrame* frame = it.frame();
@@ skipping 1983 matching lines @@
     {
       Locker locker;
       Debugger::CallMessageDispatchHandler();
     }
   }
 }
 
 #endif  // ENABLE_DEBUGGER_SUPPORT
 
 } }  // namespace v8::internal