[ic] Fix megamorphic stub cache probing on some platforms.

src/objects.cc

Index: src/objects.cc
diff --git a/src/objects.cc b/src/objects.cc
index ad7df3765f14a2f9334a5970b565a137242e395d..6fa034a87d896cf499e6ce22b8f51a54dd166b4a 100644
--- a/src/objects.cc
+++ b/src/objects.cc
@@ -17426,6 +17426,17 @@ Handle<UnseededNumberDictionary> UnseededNumberDictionary::AddNumberEntry(
   return Add(dictionary, key, value, PropertyDetails::Empty());
 }
 
+Handle<UnseededNumberDictionary> UnseededNumberDictionary::DeleteKey(
+    Handle<UnseededNumberDictionary> dictionary, uint32_t key) {
+  int entry = dictionary->FindEntry(key);
+  if (entry == kNotFound) return dictionary;
+
+  Factory* factory = dictionary->GetIsolate()->factory();
+  dictionary->SetEntry(entry, factory->the_hole_value(),
+                       factory->the_hole_value());
+  dictionary->ElementRemoved();
+  return dictionary->Shrink(dictionary, key);
+}
 
 Handle<SeededNumberDictionary> SeededNumberDictionary::AtNumberPut(
     Handle<SeededNumberDictionary> dictionary, uint32_t key,