Expose well-known Symbols to C++ API.

src/heap/heap.h

 // 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.
 
 #ifndef V8_HEAP_HEAP_H_
 #define V8_HEAP_HEAP_H_
 
 #include <cmath>
 
 #include "src/allocation.h"
@@ skipping 276 matching lines @@
   V(index_string, "index")                                         \
   V(last_index_string, "lastIndex")                                \
   V(object_string, "object")                                       \
   V(prototype_string, "prototype")                                 \
   V(string_string, "string")                                       \
   V(String_string, "String")                                       \
   V(symbol_string, "symbol")                                       \
   V(Symbol_string, "Symbol")                                       \
   V(for_string, "for")                                             \
   V(for_api_string, "for_api")                                     \
+  V(for_intern_string, "for_intern")                               \
   V(private_api_string, "private_api")                             \
   V(private_intern_string, "private_intern")                       \
   V(Date_string, "Date")                                           \
   V(char_at_string, "CharAt")                                      \
   V(undefined_string, "undefined")                                 \
   V(value_of_string, "valueOf")                                    \
   V(stack_string, "stack")                                         \
   V(toJSON_string, "toJSON")                                       \
   V(KeyedLoadMonomorphic_string, "KeyedLoadMonomorphic")           \
   V(KeyedStoreMonomorphic_string, "KeyedStoreMonomorphic")         \
@@ skipping 2212 matching lines @@
   DisallowHeapAllocation no_allocation;  // i.e. no gc allowed.
 
  private:
   DISALLOW_IMPLICIT_CONSTRUCTORS(PathTracer);
 };
 #endif  // DEBUG
 }
 }  // namespace v8::internal
 
 #endif  // V8_HEAP_HEAP_H_