[stubs] Add more assertions in the CodeStubAssembler

src/interpreter/interpreter-assembler.cc

 // Copyright 2015 the V8 project authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "src/interpreter/interpreter-assembler.h"
 
 #include <limits>
 #include <ostream>
 
 #include "src/code-factory.h"
@@ skipping 758 matching lines @@
   {
     // Cache the called function in a feedback vector slot. Cache states
     // are uninitialized, monomorphic (indicated by a JSFunction), and
     // megamorphic.
     // TODO(mythria/v8:5210): Check if it is better to mark extra_checks as a
     // deferred block so that call_construct_function will be scheduled.
     Label extra_checks(this), call_construct_function(this);
 
     Node* feedback_element =
         LoadFixedArrayElement(type_feedback_vector, slot_id);
-    Node* feedback_value = LoadWeakCellValue(feedback_element);
+    Node* feedback_value = LoadWeakCellValueUnchecked(feedback_element);
     Node* is_monomorphic = WordEqual(constructor, feedback_value);
     Branch(is_monomorphic, &call_construct_function, &extra_checks);
 
     Bind(&extra_checks);
     {
       Label mark_megamorphic(this), initialize(this),
           check_allocation_site(this), check_initialized(this),
           set_alloc_feedback_and_call(this);
       {
         // Check if it is a megamorphic target
@@ skipping 588 matching lines @@
     Goto(&loop);
   }
   Bind(&done_loop);
 
   return array;
 }
 
 }  // namespace interpreter
 }  // namespace internal
 }  // namespace v8