[stubs] Add more assertions in the CodeStubAssembler

src/code-stubs.cc

 // Copyright 2012 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/code-stubs.h"
 
 #include <sstream>
 
 #include "src/ast/ast.h"
 #include "src/bootstrapper.h"
@@ skipping 2017 matching lines @@
 
   Label miss(assembler);
 
   if (check_global()) {
     // Check that the map of the global has not changed: use a placeholder map
     // that will be replaced later with the global object's map.
     Node* proxy_map = assembler->LoadMap(receiver);
     Node* global = assembler->LoadObjectField(proxy_map, Map::kPrototypeOffset);
     Node* map_cell = assembler->HeapConstant(isolate()->factory()->NewWeakCell(
         StoreGlobalStub::global_map_placeholder(isolate())));
-    Node* expected_map = assembler->LoadWeakCellValue(map_cell);
+    Node* expected_map = assembler->LoadWeakCellValueUnchecked(map_cell);
     Node* map = assembler->LoadMap(global);
     assembler->GotoIf(assembler->WordNotEqual(expected_map, map), &miss);
   }
 
   Node* weak_cell = assembler->HeapConstant(isolate()->factory()->NewWeakCell(
       StoreGlobalStub::property_cell_placeholder(isolate())));
   Node* cell = assembler->LoadWeakCellValue(weak_cell);
   assembler->GotoIf(assembler->TaggedIsSmi(cell), &miss);
 
   // Load the payload of the global parameter cell. A hole indicates that the
@@ skipping 1268 matching lines @@
 
   if (type == MachineType::Pointer()) {
     return Representation::External();
   }
 
   return Representation::Tagged();
 }
 
 }  // namespace internal
 }  // namespace v8