remove undetectable strings

src/heap/heap.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 "src/v8.h"
 
 #include "src/accessors.h"
 #include "src/api.h"
 #include "src/base/bits.h"
 #include "src/base/once.h"
@@ skipping 2698 matching lines @@
       roots_[entry.index] = map;
     }
 
     {  // Create a separate external one byte string map for native sources.
       AllocationResult allocation = AllocateMap(EXTERNAL_ONE_BYTE_STRING_TYPE,
                                                 ExternalOneByteString::kSize);
       if (!allocation.To(&obj)) return false;
       set_native_source_string_map(Map::cast(obj));
     }
 
-    ALLOCATE_VARSIZE_MAP(STRING_TYPE, undetectable_string)
-    undetectable_string_map()->set_is_undetectable();
-
-    ALLOCATE_VARSIZE_MAP(ONE_BYTE_STRING_TYPE, undetectable_one_byte_string);
-    undetectable_one_byte_string_map()->set_is_undetectable();
-
     ALLOCATE_VARSIZE_MAP(FIXED_DOUBLE_ARRAY_TYPE, fixed_double_array)
     ALLOCATE_VARSIZE_MAP(BYTE_ARRAY_TYPE, byte_array)
     ALLOCATE_VARSIZE_MAP(FREE_SPACE_TYPE, free_space)
 
 #define ALLOCATE_EXTERNAL_ARRAY_MAP(Type, type, TYPE, ctype, size)        \
   ALLOCATE_MAP(EXTERNAL_##TYPE##_ARRAY_TYPE, ExternalArray::kAlignedSize, \
                external_##type##_array)
 
     TYPED_ARRAYS(ALLOCATE_EXTERNAL_ARRAY_MAP)
 #undef ALLOCATE_EXTERNAL_ARRAY_MAP
@@ skipping 3797 matching lines @@
       static_cast<int>(object_sizes_last_time_[index]));
   CODE_AGE_LIST_COMPLETE(ADJUST_LAST_TIME_OBJECT_COUNT)
 #undef ADJUST_LAST_TIME_OBJECT_COUNT
 
   MemCopy(object_counts_last_time_, object_counts_, sizeof(object_counts_));
   MemCopy(object_sizes_last_time_, object_sizes_, sizeof(object_sizes_));
   ClearObjectStats();
 }
 }
 }  // namespace v8::internal