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

src/objects.h

Index: src/objects.h
diff --git a/src/objects.h b/src/objects.h
index 9f2651c40f7985fe6bab498f7dd8a34c16554150..f7e6e0b10745ad7664ba288223e5f632042233a6 100644
--- a/src/objects.h
+++ b/src/objects.h
@@ -3769,6 +3769,8 @@ class UnseededNumberDictionary
       Handle<UnseededNumberDictionary> dictionary,
       uint32_t key,
       Handle<Object> value);
+  static Handle<UnseededNumberDictionary> DeleteKey(
+      Handle<UnseededNumberDictionary> dictionary, uint32_t key);
 
   // Set an existing entry or add a new one if needed.
   // Return the updated dictionary.