Use a dictionary-mode code cache on the map rather than a dual system.

src/ic/ia32/ic-ia32.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.
 
 #if V8_TARGET_ARCH_IA32
 
 #include "src/codegen.h"
 #include "src/ic/ic.h"
 #include "src/ic/ic-compiler.h"
 #include "src/ic/stub-cache.h"
@@ skipping 318 matching lines @@
 
   // The handlers in the stub cache expect a vector and slot. Since we won't
   // change the IC from any downstream misses, a dummy vector can be used.
   Handle<TypeFeedbackVector> dummy_vector =
       TypeFeedbackVector::DummyVector(isolate);
   int slot = dummy_vector->GetIndex(
       FeedbackVectorSlot(TypeFeedbackVector::kDummyKeyedLoadICSlot));
   __ push(Immediate(Smi::FromInt(slot)));
   __ push(Immediate(dummy_vector));
 
-  Code::Flags flags = Code::RemoveTypeAndHolderFromFlags(
-      Code::ComputeHandlerFlags(Code::LOAD_IC));
+  Code::Flags flags =
+      Code::RemoveHolderFromFlags(Code::ComputeHandlerFlags(Code::LOAD_IC));
   masm->isolate()->stub_cache()->GenerateProbe(masm, Code::KEYED_LOAD_IC, flags,
                                                receiver, key, ebx, edi);
 
   __ pop(LoadWithVectorDescriptor::VectorRegister());
   __ pop(LoadDescriptor::SlotRegister());
 
   // Cache miss.
   GenerateMiss(masm);
 
   // Do a quick inline probe of the receiver's dictionary, if it
@@ skipping 205 matching lines @@
 
   // The handlers in the stub cache expect a vector and slot. Since we won't
   // change the IC from any downstream misses, a dummy vector can be used.
   Handle<TypeFeedbackVector> dummy_vector =
       TypeFeedbackVector::DummyVector(masm->isolate());
   int slot = dummy_vector->GetIndex(
       FeedbackVectorSlot(TypeFeedbackVector::kDummyKeyedStoreICSlot));
   __ push(Immediate(Smi::FromInt(slot)));
   __ push(Immediate(dummy_vector));
 
-  Code::Flags flags = Code::RemoveTypeAndHolderFromFlags(
-      Code::ComputeHandlerFlags(Code::STORE_IC));
+  Code::Flags flags =
+      Code::RemoveHolderFromFlags(Code::ComputeHandlerFlags(Code::STORE_IC));
   masm->isolate()->stub_cache()->GenerateProbe(masm, Code::STORE_IC, flags,
                                                receiver, key, edi, no_reg);
 
   __ pop(VectorStoreICDescriptor::VectorRegister());
   __ pop(VectorStoreICDescriptor::SlotRegister());
 
   // Cache miss.
   __ jmp(&miss);
 
   // Extra capacity case: Check if there is extra capacity to
@@ skipping 274 matching lines @@
   Condition cc =
       (check == ENABLE_INLINED_SMI_CHECK)
           ? (*jmp_address == Assembler::kJncShortOpcode ? not_zero : zero)
           : (*jmp_address == Assembler::kJnzShortOpcode ? not_carry : carry);
   *jmp_address = static_cast<byte>(Assembler::kJccShortPrefix | cc);
 }
 }  // namespace internal
 }  // namespace v8
 
 #endif  // V8_TARGET_ARCH_IA32