[stubs] Port KeyedStoreIC_Megamorphic stub to Turbofan

src/objects-inl.h

Index: src/objects-inl.h
diff --git a/src/objects-inl.h b/src/objects-inl.h
index dda3aad431d9c9e95a978d7fa933dc574e2ed1c0..c8555758cb80fa75bc0eb0409df6d88f043a71bc 100644
--- a/src/objects-inl.h
+++ b/src/objects-inl.h
@@ -1670,18 +1670,6 @@ AllocationSiteMode AllocationSite::GetMode(
   return DONT_TRACK_ALLOCATION_SITE;
 }
 
-
-AllocationSiteMode AllocationSite::GetMode(ElementsKind from,
-                                           ElementsKind to) {
-  if (IsFastSmiElementsKind(from) &&
-      IsMoreGeneralElementsKindTransition(from, to)) {
-    return TRACK_ALLOCATION_SITE;
-  }
-
-  return DONT_TRACK_ALLOCATION_SITE;
-}
-
-
 inline bool AllocationSite::CanTrack(InstanceType type) {
   if (FLAG_allocation_site_pretenuring) {
     return type == JS_ARRAY_TYPE ||