[stubs] KeyedLoadIC_Megamorphic: use stub cache lookup as fallback

src/code-stub-assembler.cc

 // Copyright 2016 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-stub-assembler.h"
 #include "src/code-factory.h"
 #include "src/frames-inl.h"
 #include "src/frames.h"
 #include "src/ic/handler-configuration.h"
 #include "src/ic/stub-cache.h"
@@ skipping 4851 matching lines @@
     // See also TryLookupProperty() which has the same limitation.
     const int32_t kMaxLinear = 210;
     Label stub_cache(this);
     Node* bitfield3 = LoadMapBitField3(receiver_map);
     Node* nof = BitFieldDecodeWord<Map::NumberOfOwnDescriptorsBits>(bitfield3);
     GotoIf(UintPtrGreaterThan(nof, IntPtrConstant(kMaxLinear)), &stub_cache);
     Node* descriptors = LoadMapDescriptors(receiver_map);
     Variable var_name_index(this, MachineType::PointerRepresentation());
     Label if_descriptor_found(this);
     DescriptorLookupLinear(key, descriptors, nof, &if_descriptor_found,
-                           &var_name_index, &slow);
+                           &var_name_index, &stub_cache);
 
     Bind(&if_descriptor_found);
     {
       LoadPropertyFromFastObject(receiver, receiver_map, descriptors,
                                  var_name_index.value(), &var_details,
                                  &var_value);
       Goto(&if_found_on_receiver);
     }
 
     Bind(&stub_cache);
@@ skipping 775 matching lines @@
                        Heap::kTheHoleValueRootIndex);
 
   // Store the WeakCell in the feedback vector.
   StoreFixedArrayElement(feedback_vector, slot, cell, UPDATE_WRITE_BARRIER,
                          CodeStubAssembler::SMI_PARAMETERS);
   return cell;
 }
 
 }  // namespace internal
 }  // namespace v8