[elements, turbofan] Implement simple GrowElements

src/objects.h

Index: src/objects.h
diff --git a/src/objects.h b/src/objects.h
index a9ecb112e2cbb5dfd5c7a76095260916d8379068..08c75649337adb2156bd7e82ff3ece6b119e17d8 100644
--- a/src/objects.h
+++ b/src/objects.h
@@ -1842,6 +1842,8 @@ enum class KeyCollectionMode {
       static_cast<int>(v8::KeyCollectionMode::kIncludePrototypes)
 };
 
+enum class AllocationSiteUpdateMode { kUpdate, kCheckOnly };
+
 // JSReceiver includes types on which properties can be defined, i.e.,
 // JSObject and JSProxy.
 class JSReceiver: public HeapObject {
@@ -2292,7 +2294,9 @@ class JSObject: public JSReceiver {
   }
 
   // These methods do not perform access checks!
-  static void UpdateAllocationSite(Handle<JSObject> object,
+  template <AllocationSiteUpdateMode update_or_check =
+                AllocationSiteUpdateMode::kUpdate>
+  static bool UpdateAllocationSite(Handle<JSObject> object,
                                    ElementsKind to_kind);
 
   // Lookup interceptors are used for handling properties controlled by host
@@ -8656,7 +8660,9 @@ class AllocationSite: public Struct {
 
   inline bool SitePointsToLiteral();
 
-  static void DigestTransitionFeedback(Handle<AllocationSite> site,
+  template <AllocationSiteUpdateMode update_or_check =
+                AllocationSiteUpdateMode::kUpdate>
+  static bool DigestTransitionFeedback(Handle<AllocationSite> site,
                                        ElementsKind to_kind);
 
   DECLARE_PRINTER(AllocationSite)