whole_func_string: function PostNatives(utils) {
    %CheckIsBootstrapping();
  
    for ( ; !IS_UNDEFINED(imports); imports = imports.next) {
      imports(exports_container);
    }
  
    // Whitelist of exports from normal natives to experimental natives and debug.
    var expose_list = [
      "AddBoundMethod",
      "ArrayToString",
      "AsyncFunctionNext",
      "AsyncFunctionThrow",
      "ErrorToString",
      "GetIterator",
      "GetMethod",
      "IntlParseDate",
      "IntlParseNumber",
      "IsNaN",
      "MakeError",
      "MakeRangeError",
      "MakeTypeError",
      "MapEntries",
      "MapIterator",
      "MapIteratorNext",
      "MaxSimple",
      "MinSimple",
      "NumberIsInteger",
      "PromiseChain",
      "PromiseDefer",
      "PromiseAccept",
      "PromiseCreateRejected",
      "PromiseCreateResolved",
      "PromiseThen",
      "RegExpSubclassExecJS",
      "RegExpSubclassMatch",
      "RegExpSubclassReplace",
      "RegExpSubclassSearch",
      "RegExpSubclassSplit",
      "RegExpSubclassTest",
      "SetIterator",
      "SetIteratorNext",
      "SetValues",
      "SymbolToString",
      "ToLocaleLowerCaseI18N",
      "ToLocaleUpperCaseI18N",
      "ToLowerCaseI18N",
      "ToPositiveInteger",
      "ToUpperCaseI18N",
      // From runtime:
      "is_concat_spreadable_symbol",
      "iterator_symbol",
      "promise_result_symbol",
      "promise_state_symbol",
      "object_freeze",
      "object_is_frozen",
      "object_is_sealed",
      "reflect_apply",
      "reflect_construct",
      "regexp_flags_symbol",
      "to_string_tag_symbol",
      "object_to_string",
      "species_symbol",
      "match_symbol",
      "replace_symbol",
      "search_symbol",
      "split_symbol",
    ];
  
    var filtered_exports = {};
    %OptimizeObjectForAddingMultipleProperties(
        filtered_exports, expose_list.length);
    for (var key of expose_list) {
      filtered_exports[key] = exports_container[key];
    }
    %ToFastProperties(filtered_exports);
    exports_container = filtered_exports;
  
    utils.PostNatives = UNDEFINED;
    utils.ImportFromExperimental = UNDEFINED;
  }
func_code_string: function PostNatives(utils) {
    %CheckIsBootstrapping();
  
    for ( ; !IS_UNDEFINED(imports); imports = imports.next) {
      imports(exports_container);
    }
  
    // Whitelist of exports from normal natives to experimental natives and debug.
    var expose_list = [
      "AddBoundMethod",
      "ArrayToString",
      "AsyncFunctionNext",
      "AsyncFunctionThrow",
      "ErrorToString",
      "GetIterator",
      "GetMethod",
      "IntlParseDate",
      "IntlParseNumber",
      "IsNaN",
      "MakeError",
      "MakeRangeError",
      "MakeTypeError",
      "MapEntries",
      "MapIterator",
      "MapIteratorNext",
      "MaxSimple",
      "MinSimple",
      "NumberIsInteger",
      "PromiseChain",
      "PromiseDefer",
      "PromiseAccept",
      "PromiseCreateRejected",
      "PromiseCreateResolved",
      "PromiseThen",
      "RegExpSubclassExecJS",
      "RegExpSubclassMatch",
      "RegExpSubclassReplace",
      "RegExpSubclassSearch",
      "RegExpSubclassSplit",
      "RegExpSubclassTest",
      "SetIterator",
      "SetIteratorNext",
      "SetValues",
      "SymbolToString",
      "ToLocaleLowerCaseI18N",
      "ToLocaleUpperCaseI18N",
      "ToLowerCaseI18N",
      "ToPositiveInteger",
      "ToUpperCaseI18N",
      // From runtime:
      "is_concat_spreadable_symbol",
      "iterator_symbol",
      "promise_result_symbol",
      "promise_state_symbol",
      "object_freeze",
      "object_is_frozen",
      "object_is_sealed",
      "reflect_apply",
      "reflect_construct",
      "regexp_flags_symbol",
      "to_string_tag_symbol",
      "object_to_string",
      "species_symbol",
      "match_symbol",
      "replace_symbol",
      "search_symbol",
      "split_symbol",
    ];
  
    var filtered_exports = {};
    %OptimizeObjectForAddingMultipleProperties(
        filtered_exports, expose_list.length);
    for (var key of expose_list) {
      filtered_exports[key] = exports_container[key];
    }
    %ToFastProperties(filtered_exports);
    exports_container = filtered_exports;
  
    utils.PostNatives = UNDEFINED;
    utils.ImportFromExperimental = UNDEFINED;
  }
func_documentation_string: ----------------------------------------------------------------------- To be called by bootstrapper