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

src/s390/code-stubs-s390.cc

Index: src/s390/code-stubs-s390.cc
diff --git a/src/s390/code-stubs-s390.cc b/src/s390/code-stubs-s390.cc
index dc3fc7897e5da55da17fecf26278ae89ab7c0860..46f28a3d287cb3861ebacc11164ac4948395911d 100644
--- a/src/s390/code-stubs-s390.cc
+++ b/src/s390/code-stubs-s390.cc
@@ -3591,11 +3591,8 @@ void LoadICStub::GenerateImpl(MacroAssembler* masm, bool in_frame) {
   __ bind(&not_array);
   __ CompareRoot(feedback, Heap::kmegamorphic_symbolRootIndex);
   __ bne(&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,
-                                               receiver_map, scratch1, r9);
+  masm->isolate()->load_stub_cache()->GenerateProbe(
+      masm, receiver, name, feedback, receiver_map, scratch1, r9);
 
   __ bind(&miss);
   LoadIC::GenerateMiss(masm);
@@ -3726,11 +3723,8 @@ void VectorStoreICStub::GenerateImpl(MacroAssembler* masm, bool in_frame) {
   __ bind(&not_array);
   __ CompareRoot(feedback, Heap::kmegamorphic_symbolRootIndex);
   __ bne(&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, receiver_map,
-      scratch1, scratch2);
+  masm->isolate()->store_stub_cache()->GenerateProbe(
+      masm, receiver, key, feedback, receiver_map, scratch1, scratch2);
 
   __ bind(&miss);
   StoreIC::GenerateMiss(masm);