Don't use the keyed slow stub for named handlers.

src/ic/arm64/ic-arm64.cc

 // Copyright 2013 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.
 
 #if V8_TARGET_ARCH_ARM64
 
 #include "src/codegen.h"
 #include "src/ic/ic.h"
 #include "src/ic/ic-compiler.h"
 #include "src/ic/stub-cache.h"
@@ skipping 657 matching lines @@
   DCHECK(!AreAliased(vector, slot, x5, x6, x7, x8));
   Handle<TypeFeedbackVector> dummy_vector =
       TypeFeedbackVector::DummyVector(masm->isolate());
   int slot_index = dummy_vector->GetIndex(
       FeedbackVectorSlot(TypeFeedbackVector::kDummyKeyedStoreICSlot));
   __ LoadRoot(vector, Heap::kDummyVectorRootIndex);
   __ Mov(slot, Operand(Smi::FromInt(slot_index)));
 
   Code::Flags flags =
       Code::RemoveHolderFromFlags(Code::ComputeHandlerFlags(Code::STORE_IC));
-  masm->isolate()->stub_cache()->GenerateProbe(masm, Code::STORE_IC, flags,
-                                               receiver, key, x5, x6, x7, x8);
+  masm->isolate()->stub_cache()->GenerateProbe(
+      masm, Code::KEYED_STORE_IC, flags, receiver, key, x5, x6, x7, x8);
   // Cache miss.
   __ B(&miss);
 
   __ Bind(&extra);
   // Extra capacity case: Check if there is extra capacity to
   // perform the store and update the length. Used for adding one
   // element to the array by writing to array[array.length].
 
   // Check for room in the elements backing store.
   // Both the key and the length of FixedArray are smis.
@@ skipping 168 matching lines @@
   } else {
     DCHECK(to_patch->Mask(TestBranchMask) == TBNZ);
     // This is JumpIfSmi(smi_reg, branch_imm).
     patcher.tbz(smi_reg, 0, branch_imm);
   }
 }
 }  // namespace internal
 }  // namespace v8
 
 #endif  // V8_TARGET_ARCH_ARM64