Revert "[SAB] Move Atomics builtins to C++"

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/heap/heap.h"
 
 #include "src/accessors.h"
 #include "src/api.h"
 #include "src/assembler-inl.h"
 #include "src/ast/context-slot-cache.h"
@@ skipping 2768 matching lines @@
   // Allocate cache for string split and regexp-multiple.
   set_string_split_cache(*factory->NewFixedArray(
       RegExpResultsCache::kRegExpResultsCacheSize, TENURED));
   set_regexp_multiple_cache(*factory->NewFixedArray(
       RegExpResultsCache::kRegExpResultsCacheSize, TENURED));
 
   // Allocate cache for external strings pointing to native source code.
   set_natives_source_cache(
       *factory->NewFixedArray(Natives::GetBuiltinsCount()));
 
+  set_experimental_natives_source_cache(
+      *factory->NewFixedArray(ExperimentalNatives::GetBuiltinsCount()));
+
   set_extra_natives_source_cache(
       *factory->NewFixedArray(ExtraNatives::GetBuiltinsCount()));
 
   set_experimental_extra_natives_source_cache(
       *factory->NewFixedArray(ExperimentalExtraNatives::GetBuiltinsCount()));
 
   set_undefined_cell(*factory->NewCell(factory->undefined_value()));
 
   // Microtask queue uses the empty fixed array as a sentinel for "empty".
   // Number of queued microtasks stored in Isolate::pending_microtask_count().
@@ skipping 3599 matching lines @@
 }
 
 
 // static
 int Heap::GetStaticVisitorIdForMap(Map* map) {
   return StaticVisitorBase::GetVisitorId(map);
 }
 
 }  // namespace internal
 }  // namespace v8