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

src/snapshot/natives.h

Index: src/snapshot/natives.h
diff --git a/src/snapshot/natives.h b/src/snapshot/natives.h
index 0f09e207dc4db5f1fe3591f15fb734d2c00fd469..a9dc306a3d45b1a5fd0f43ab7e4bfa3d9610ea4f 100644
--- a/src/snapshot/natives.h
+++ b/src/snapshot/natives.h
@@ -15,6 +15,7 @@ namespace internal {
 
 enum NativeType {
   CORE,
+  EXPERIMENTAL,
   EXTRAS,
   EXPERIMENTAL_EXTRAS,
   D8,
@@ -53,6 +54,7 @@ class V8_EXPORT_PRIVATE NativesCollection {
 };
 
 typedef NativesCollection<CORE> Natives;
+typedef NativesCollection<EXPERIMENTAL> ExperimentalNatives;
 typedef NativesCollection<EXTRAS> ExtraNatives;
 typedef NativesCollection<EXPERIMENTAL_EXTRAS> ExperimentalExtraNatives;