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

src/mips64/code-stubs-mips64.cc

Index: src/mips64/code-stubs-mips64.cc
diff --git a/src/mips64/code-stubs-mips64.cc b/src/mips64/code-stubs-mips64.cc
index 9277f995b24f972afce27e0e8f269fe385884a53..5983a889d0d43319630a3a75ce2d9a3d4a8cfc16 100644
--- a/src/mips64/code-stubs-mips64.cc
+++ b/src/mips64/code-stubs-mips64.cc
@@ -3727,11 +3727,8 @@ void LoadICStub::GenerateImpl(MacroAssembler* masm, bool in_frame) {
   __ bind(&not_array);
   __ LoadRoot(at, Heap::kmegamorphic_symbolRootIndex);
   __ Branch(&miss, ne, feedback, Operand(at));
-  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, a7);
+  masm->isolate()->load_stub_cache()->GenerateProbe(
+      masm, receiver, name, feedback, receiver_map, scratch1, a7);
 
   __ bind(&miss);
   LoadIC::GenerateMiss(masm);
@@ -3870,11 +3867,8 @@ void VectorStoreICStub::GenerateImpl(MacroAssembler* masm, bool in_frame) {
 
   __ bind(&not_array);
   __ Branch(&miss, ne, feedback, Heap::kmegamorphic_symbolRootIndex);
-  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);