Remove special handling of fields in combination with elements transitions in Crankshaft.

src/hydrogen-instructions.cc

Index: src/hydrogen-instructions.cc
diff --git a/src/hydrogen-instructions.cc b/src/hydrogen-instructions.cc
index 743bb091c5a97efbcf1662f41e52ade8e12e5cb4..8dfd63db6f32b20e9cc5145b3600cb1ee75fbab6 100644
--- a/src/hydrogen-instructions.cc
+++ b/src/hydrogen-instructions.cc
@@ -3298,39 +3298,6 @@ HCheckMaps* HCheckMaps::New(HValue* value,
 }
 
 
-HCheckMaps* HCheckMaps::NewWithTransitions(HValue* value,
-                                           Handle<Map> map,
-                                           Zone* zone,
-                                           CompilationInfo* info) {
-  HCheckMaps* check_map = new(zone) HCheckMaps(value, zone, value);
-  check_map->map_set_.Add(map, zone);
-
-  // Since transitioned elements maps of the initial map don't fail the map
-  // check, the CheckMaps instruction doesn't need to depend on ElementsKinds.
-  check_map->ClearGVNFlag(kDependsOnElementsKind);
-
-  ElementsKind kind = map->elements_kind();
-  bool packed = IsFastPackedElementsKind(kind);
-  while (CanTransitionToMoreGeneralFastElementsKind(kind, packed)) {
-    kind = GetNextMoreGeneralFastElementsKind(kind, packed);
-    Map* transitioned_map =
-        map->LookupElementsTransitionMap(kind);
-    if (transitioned_map) {
-      check_map->map_set_.Add(Handle<Map>(transitioned_map), zone);
-    }
-  };
-
-  if (map->CanOmitMapChecks() &&
-      value->IsConstant() &&
-      HConstant::cast(value)->InstanceOf(map)) {
-    check_map->omit(info);
-  }
-
-  check_map->map_set_.Sort();
-  return check_map;
-}
-
-
 void HCheckMaps::FinalizeUniqueValueId() {
   if (!map_unique_ids_.is_empty()) return;
   Zone* zone = block()->zone();