Always initialize the debugger eagerly.

src/serialize.cc

 // Copyright 2012 the V8 project authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "v8.h"
 
 #include "accessors.h"
 #include "api.h"
 #include "bootstrapper.h"
 #include "deoptimizer.h"
@@ skipping 172 matching lines @@
               ref_table[i].id,
               ref_table[i].name,
               isolate);
   }
 
   // Debug addresses
   Add(Debug_Address(Debug::k_after_break_target_address).address(isolate),
       DEBUG_ADDRESS,
       Debug::k_after_break_target_address << kDebugIdShift,
       "Debug::after_break_target_address()");
-  Add(Debug_Address(Debug::k_debug_break_slot_address).address(isolate),
-      DEBUG_ADDRESS,
-      Debug::k_debug_break_slot_address << kDebugIdShift,
-      "Debug::debug_break_slot_address()");
-  Add(Debug_Address(Debug::k_debug_break_return_address).address(isolate),
-      DEBUG_ADDRESS,
-      Debug::k_debug_break_return_address << kDebugIdShift,
-      "Debug::debug_break_return_address()");
   Add(Debug_Address(Debug::k_restarter_frame_function_pointer).address(isolate),
       DEBUG_ADDRESS,
       Debug::k_restarter_frame_function_pointer << kDebugIdShift,
       "Debug::restarter_frame_function_pointer_address()");
 
   // Stat counters
   struct StatsRefTableEntry {
     StatsCounter* (Counters::*counter)();
     uint16_t id;
     const char* name;
@@ skipping 1662 matching lines @@
 
 bool SnapshotByteSource::AtEOF() {
   if (0u + length_ - position_ > 2 * sizeof(uint32_t)) return false;
   for (int x = position_; x < length_; x++) {
     if (data_[x] != SerializerDeserializer::nop()) return false;
   }
   return true;
 }
 
 } }  // namespace v8::internal