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

src/ic/arm64/ic-arm64.cc

Index: src/ic/arm64/ic-arm64.cc
diff --git a/src/ic/arm64/ic-arm64.cc b/src/ic/arm64/ic-arm64.cc
index 69b8c2fab10c1180cc940c8c0d3d2bef8fe9953f..938a2dff3f8389483d681825ab0fe146cca26c83 100644
--- a/src/ic/arm64/ic-arm64.cc
+++ b/src/ic/arm64/ic-arm64.cc
@@ -394,11 +394,8 @@ static void GenerateKeyedLoadWithNameKey(MacroAssembler* masm, Register key,
   __ LoadRoot(vector, Heap::kDummyVectorRootIndex);
   __ Mov(slot, Operand(Smi::FromInt(slot_index)));
 
-  Code::Flags flags =
-      Code::RemoveHolderFromFlags(Code::ComputeHandlerFlags(Code::LOAD_IC));
-  masm->isolate()->stub_cache()->GenerateProbe(masm, Code::KEYED_LOAD_IC, flags,
-                                               receiver, key, scratch1,
-                                               scratch2, scratch3, scratch4);
+  masm->isolate()->load_stub_cache()->GenerateProbe(
+      masm, receiver, key, scratch1, scratch2, scratch3, scratch4);
   // Cache miss.
   KeyedLoadIC::GenerateMiss(masm);
 
@@ -672,10 +669,8 @@ void KeyedStoreIC::GenerateMegamorphic(MacroAssembler* masm,
   __ LoadRoot(vector, Heap::kDummyVectorRootIndex);
   __ Mov(slot, Operand(Smi::FromInt(slot_index)));
 
-  Code::Flags flags =
-      Code::RemoveHolderFromFlags(Code::ComputeHandlerFlags(Code::STORE_IC));
-  masm->isolate()->stub_cache()->GenerateProbe(
-      masm, Code::KEYED_STORE_IC, flags, receiver, key, x5, x6, x7, x8);
+  masm->isolate()->store_stub_cache()->GenerateProbe(masm, receiver, key, x5,
+                                                     x6, x7, x8);
   // Cache miss.
   __ B(&miss);