[IC] Make SeededNumberDictionary::UpdateMaxNumberKey prototype aware

src/runtime/runtime-array.cc

Index: src/runtime/runtime-array.cc
diff --git a/src/runtime/runtime-array.cc b/src/runtime/runtime-array.cc
index e29ecd6c83727c57be00751bc2bac3cbdebbfa38..3e05f766ab8b3d1e473acab1cb7214bff83bbb97 100644
--- a/src/runtime/runtime-array.cc
+++ b/src/runtime/runtime-array.cc
@@ -154,8 +154,10 @@ class ArrayConcatVisitor {
     DCHECK(!fast_elements());
     Handle<SeededNumberDictionary> dict(
         SeededNumberDictionary::cast(*storage_));
+    // The object holding this backing store has just been allocated, so
+    // it cannot yet be used as a prototype.
     Handle<SeededNumberDictionary> result =
-        SeededNumberDictionary::AtNumberPut(dict, index, elm);
+        SeededNumberDictionary::AtNumberPut(dict, index, elm, false);
     if (!result.is_identical_to(dict)) {
       // Dictionary needed to grow.
       clear_storage();
@@ -207,8 +209,11 @@ class ArrayConcatVisitor {
       HandleScope loop_scope(isolate_);
       Handle<Object> element(current_storage->get(i), isolate_);
       if (!element->IsTheHole()) {
+        // The object holding this backing store has just been allocated, so
+        // it cannot yet be used as a prototype.
         Handle<SeededNumberDictionary> new_storage =
-            SeededNumberDictionary::AtNumberPut(slow_storage, i, element);
+            SeededNumberDictionary::AtNumberPut(slow_storage, i, element,
+                                                false);
         if (!new_storage.is_identical_to(slow_storage)) {
           slow_storage = loop_scope.CloseAndEscape(new_storage);
         }