first step to remove unsafe handles

src/api.cc

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+// TODO(dcarney): remove
+#define V8_ALLOW_ACCESS_TO_PERSISTENT_IMPLICIT
+
 #include "api.h"
 
 #include <string.h>  // For memcpy, strlen.
 #include <cmath>  // For isnan.
 #include "../include/v8-debug.h"
 #include "../include/v8-profiler.h"
 #include "../include/v8-testing.h"
 #include "bootstrapper.h"
 #include "code-stubs.h"
 #include "compiler.h"
@@ skipping 7387 matching lines @@
 
   v->VisitPointers(blocks_.first(), first_block_limit_);
 
   for (int i = 1; i < blocks_.length(); i++) {
     v->VisitPointers(blocks_[i], &blocks_[i][kHandleBlockSize]);
   }
 }
 
 
 } }  // namespace v8::internal