Revert 428. Breaks 64-bit compilation.

src/debug.cc

Index: src/debug.cc
===================================================================
--- src/debug.cc	(revision 429)
+++ src/debug.cc	(working copy)
@@ -610,7 +610,7 @@
 
 
 void Debug::Iterate(ObjectVisitor* v) {
-#define VISIT(field) v->VisitPointer(bit_cast<Object**, Code**>(&(field)));
+#define VISIT(field) v->VisitPointer(reinterpret_cast<Object**>(&(field)));
   VISIT(debug_break_return_entry_);
   VISIT(debug_break_return_);
 #undef VISIT
@@ -1725,7 +1725,7 @@
       }
       v8::String::Value val(json_event_string);
       Vector<uint16_t> str(reinterpret_cast<uint16_t*>(*val),
-                           json_event_string->Length());
+                          json_event_string->Length());
       SendMessage(str);
     } else {
       SendMessage(Vector<uint16_t>::empty());