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

src/ia32/code-stubs-ia32.cc

Index: src/ia32/code-stubs-ia32.cc
diff --git a/src/ia32/code-stubs-ia32.cc b/src/ia32/code-stubs-ia32.cc
index bb4f52676d356be03eae5f9f89990a649fbde72a..74bd0cfc403b4f8b4a1c3ee89e030820ccf787c1 100644
--- a/src/ia32/code-stubs-ia32.cc
+++ b/src/ia32/code-stubs-ia32.cc
@@ -3857,8 +3857,8 @@ void LoadICStub::GenerateImpl(MacroAssembler* masm, bool in_frame) {
   __ j(not_equal, &miss);
   __ push(slot);
   __ push(vector);
-  Code::Flags code_flags = Code::RemoveTypeAndHolderFromFlags(
-      Code::ComputeHandlerFlags(Code::LOAD_IC));
+  Code::Flags code_flags =
+      Code::RemoveHolderFromFlags(Code::ComputeHandlerFlags(Code::LOAD_IC));
   masm->isolate()->stub_cache()->GenerateProbe(masm, Code::LOAD_IC, code_flags,
                                                receiver, name, vector, scratch);
   __ pop(vector);
@@ -4118,8 +4118,8 @@ void VectorStoreICStub::GenerateImpl(MacroAssembler* masm, bool in_frame) {
   __ pop(value);
   __ push(slot);
   __ push(vector);
-  Code::Flags code_flags = Code::RemoveTypeAndHolderFromFlags(
-      Code::ComputeHandlerFlags(Code::STORE_IC));
+  Code::Flags code_flags =
+      Code::RemoveHolderFromFlags(Code::ComputeHandlerFlags(Code::STORE_IC));
   masm->isolate()->stub_cache()->GenerateProbe(masm, Code::STORE_IC, code_flags,
                                                receiver, key, slot, no_reg);
   __ pop(vector);