[ic] Split megamorphic stub cache in two caches (for loads and for stores).

src/x64/code-stubs-x64.cc

Index: src/x64/code-stubs-x64.cc
diff --git a/src/x64/code-stubs-x64.cc b/src/x64/code-stubs-x64.cc
index 773c37a391e66ec00c3577b2e3520ad1c2fdf981..2d0a40e6c3b5c7123e60b0fcc87617ab847c8b50 100644
--- a/src/x64/code-stubs-x64.cc
+++ b/src/x64/code-stubs-x64.cc
@@ -3390,10 +3390,8 @@ void LoadICStub::GenerateImpl(MacroAssembler* masm, bool in_frame) {
   __ bind(&not_array);
   __ CompareRoot(feedback, Heap::kmegamorphic_symbolRootIndex);
   __ j(not_equal, &miss);
-  Code::Flags code_flags =
-      Code::RemoveHolderFromFlags(Code::ComputeHandlerFlags(Code::LOAD_IC));
-  masm->isolate()->stub_cache()->GenerateProbe(
-      masm, Code::LOAD_IC, code_flags, receiver, name, feedback, no_reg);
+  masm->isolate()->load_stub_cache()->GenerateProbe(masm, receiver, name,
+                                                    feedback, no_reg);
 
   __ bind(&miss);
   LoadIC::GenerateMiss(masm);
@@ -3532,10 +3530,8 @@ void VectorStoreICStub::GenerateImpl(MacroAssembler* masm, bool in_frame) {
   __ CompareRoot(feedback, Heap::kmegamorphic_symbolRootIndex);
   __ j(not_equal, &miss);
 
-  Code::Flags code_flags =
-      Code::RemoveHolderFromFlags(Code::ComputeHandlerFlags(Code::STORE_IC));
-  masm->isolate()->stub_cache()->GenerateProbe(masm, Code::STORE_IC, code_flags,
-                                               receiver, key, feedback, no_reg);
+  masm->isolate()->store_stub_cache()->GenerateProbe(masm, receiver, key,
+                                                     feedback, no_reg);
 
   __ bind(&miss);
   StoreIC::GenerateMiss(masm);