[turbofan] Don't flush LoadElimination on unsupported field stores.

src/compiler/load-elimination.h

Index: src/compiler/load-elimination.h
diff --git a/src/compiler/load-elimination.h b/src/compiler/load-elimination.h
index 174cbfcbcd626f14b1c4e0b4a9095eed5f9ece59..50979e4da8cba8fdd1d802506bdc3f90ec90889e 100644
--- a/src/compiler/load-elimination.h
+++ b/src/compiler/load-elimination.h
@@ -167,6 +167,7 @@ class V8_EXPORT_PRIVATE LoadElimination final
                                   Zone* zone) const;
     AbstractState const* KillField(Node* object, size_t index,
                                    Zone* zone) const;
+    AbstractState const* KillFields(Node* object, Zone* zone) const;
     Node* LookupField(Node* object, size_t index) const;
 
     AbstractState const* AddElement(Node* object, Node* index, Node* value,