[es6] Implement spec compliant ToPrimitive in the runtime.

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 <map>
 
@@ skipping 200 matching lines @@
 #define INTERNALIZED_STRING_LIST(V)                            \
   V(Object_string, "Object")                                   \
   V(proto_string, "__proto__")                                 \
   V(arguments_string, "arguments")                             \
   V(Arguments_string, "Arguments")                             \
   V(caller_string, "caller")                                   \
   V(boolean_string, "boolean")                                 \
   V(Boolean_string, "Boolean")                                 \
   V(callee_string, "callee")                                   \
   V(constructor_string, "constructor")                         \
+  V(default_string, "default")                                 \
   V(dot_result_string, ".result")                              \
   V(eval_string, "eval")                                       \
   V(float32x4_string, "float32x4")                             \
   V(Float32x4_string, "Float32x4")                             \
   V(int32x4_string, "int32x4")                                 \
   V(Int32x4_string, "Int32x4")                                 \
   V(uint32x4_string, "uint32x4")                               \
   V(Uint32x4_string, "Uint32x4")                               \
   V(bool32x4_string, "bool32x4")                               \
   V(Bool32x4_string, "Bool32x4")                               \
@@ skipping 40 matching lines @@
   V(Symbol_string, "Symbol")                                   \
   V(Map_string, "Map")                                         \
   V(Set_string, "Set")                                         \
   V(WeakMap_string, "WeakMap")                                 \
   V(WeakSet_string, "WeakSet")                                 \
   V(for_string, "for")                                         \
   V(for_api_string, "for_api")                                 \
   V(Date_string, "Date")                                       \
   V(char_at_string, "CharAt")                                  \
   V(undefined_string, "undefined")                             \
-  V(value_of_string, "valueOf")                                \
+  V(valueOf_string, "valueOf")                                 \
   V(stack_string, "stack")                                     \
+  V(toString_string, "toString")                               \
   V(toJSON_string, "toJSON")                                   \
   V(KeyedLoadMonomorphic_string, "KeyedLoadMonomorphic")       \
   V(KeyedStoreMonomorphic_string, "KeyedStoreMonomorphic")     \
   V(illegal_access_string, "illegal access")                   \
   V(cell_value_string, "%cell_value")                          \
   V(illegal_argument_string, "illegal argument")               \
   V(closure_string, "(closure)")                               \
   V(dot_string, ".")                                           \
   V(compare_ic_string, "==")                                   \
   V(strict_compare_ic_string, "===")                           \
@@ skipping 53 matching lines @@
   V(string_iterator_next_index_symbol)      \
   V(uninitialized_symbol)
 
 
 #define PUBLIC_SYMBOL_LIST(V)                                    \
   V(has_instance_symbol, symbolHasInstance, Symbol.hasInstance)  \
   V(is_concat_spreadable_symbol, symbolIsConcatSpreadable,       \
     Symbol.isConcatSpreadable)                                   \
   V(is_regexp_symbol, symbolIsRegExp, Symbol.isRegExp)           \
   V(iterator_symbol, symbolIterator, Symbol.iterator)            \
+  V(to_primitive_symbol, symbolToPrimitive, Symbol.toPrimitive)  \
   V(to_string_tag_symbol, symbolToStringTag, Symbol.toStringTag) \
   V(unscopables_symbol, symbolUnscopables, Symbol.unscopables)
 
 // Heap roots that are known to be immortal immovable, for which we can safely
 // skip write barriers. This list is not complete and has omissions.
 #define IMMORTAL_IMMOVABLE_ROOT_LIST(V) \
   V(ByteArrayMap)                       \
   V(BytecodeArrayMap)                   \
   V(FreeSpaceMap)                       \
   V(OnePointerFillerMap)                \
@@ skipping 2430 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_