[ic] Load IC data handlers now support prototype chain checks with global and dictionary objects.

src/ic/arm64/handler-compiler-arm64.cc

Index: src/ic/arm64/handler-compiler-arm64.cc
diff --git a/src/ic/arm64/handler-compiler-arm64.cc b/src/ic/arm64/handler-compiler-arm64.cc
index efa96e2d25a354494ae5b2bc12848b7901355a4f..0dce85261b9a5729a7bbbdb479ebf50fbea8137c 100644
--- a/src/ic/arm64/handler-compiler-arm64.cc
+++ b/src/ic/arm64/handler-compiler-arm64.cc
@@ -508,10 +508,7 @@ Register PropertyHandlerCompiler::CheckPrototypes(
                                 name, scratch2, miss);
     } else if (current_map->is_dictionary_map()) {
       DCHECK(!current_map->IsJSGlobalProxyMap());  // Proxy maps are fast.
-      if (!name->IsUniqueName()) {
-        DCHECK(name->IsString());
-        name = factory()->InternalizeString(Handle<String>::cast(name));
-      }
+      DCHECK(name->IsUniqueName());
       DCHECK(current.is_null() || (current->property_dictionary()->FindEntry(
                                        name) == NameDictionary::kNotFound));