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

src/x87/code-stubs-x87.cc

Index: src/x87/code-stubs-x87.cc
diff --git a/src/x87/code-stubs-x87.cc b/src/x87/code-stubs-x87.cc
index c9878a6f56319fedda828f37e973ca5e5c1e5900..fa7945afffa508c9384c7d40a7dc867a615c5385 100644
--- a/src/x87/code-stubs-x87.cc
+++ b/src/x87/code-stubs-x87.cc
@@ -3549,8 +3549,8 @@ 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);
@@ -3810,8 +3810,8 @@ 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);