[stubs] Fix negative index lookup in hasOwnProperty

src/builtins/builtins-object.cc

Index: src/builtins/builtins-object.cc
diff --git a/src/builtins/builtins-object.cc b/src/builtins/builtins-object.cc
index 85254d5dcd7527489d9f95424ff7865175013b6b..eba065e5b345484dc91e912248efc52b92df2b34 100644
--- a/src/builtins/builtins-object.cc
+++ b/src/builtins/builtins-object.cc
@@ -48,6 +48,10 @@ void Builtins::Generate_ObjectHasOwnProperty(
                               &return_false, &call_runtime);
 
   assembler.Bind(&keyisindex);
+  // Handle negative keys in the runtime.
+  assembler.GotoIf(
+      assembler.IntPtrLessThan(var_index.value(), assembler.IntPtrConstant(0)),
+      &call_runtime);
   assembler.TryLookupElement(object, map, instance_type, var_index.value(),
                              &return_true, &return_false, &call_runtime);