[ic] [stubs] Don't use Code::flags in megamorphic stub cache hash computations.

src/code-stubs.h

Index: src/code-stubs.h
diff --git a/src/code-stubs.h b/src/code-stubs.h
index 5f802235afa11138c8f135465f79f6244667e10d..655ea15c065177422a9e6dc12d3c678ba0da909a 100644
--- a/src/code-stubs.h
+++ b/src/code-stubs.h
@@ -1377,6 +1377,7 @@ class FunctionPrototypeStub : public PlatformCodeStub {
       : PlatformCodeStub(isolate) {}
 
   Code::Kind GetCodeKind() const override { return Code::HANDLER; }
+  ExtraICState GetExtraICState() const override { return Code::LOAD_IC; }
 
   // TODO(mvstanton): only the receiver register is accessed. When this is
   // translated to a hydrogen code stub, a new CallInterfaceDescriptor
@@ -1395,6 +1396,7 @@ class LoadIndexedStringStub : public PlatformCodeStub {
       : PlatformCodeStub(isolate) {}
 
   Code::Kind GetCodeKind() const override { return Code::HANDLER; }
+  ExtraICState GetExtraICState() const override { return Code::KEYED_LOAD_IC; }
 
   DEFINE_CALL_INTERFACE_DESCRIPTOR(Load);
   DEFINE_PLATFORM_CODE_STUB(LoadIndexedString, PlatformCodeStub);
@@ -2684,6 +2686,7 @@ class StoreFastElementStub : public HydrogenCodeStub {
   }
 
   Code::Kind GetCodeKind() const override { return Code::HANDLER; }
+  ExtraICState GetExtraICState() const override { return Code::KEYED_STORE_IC; }
 
  private:
   class ElementsKindBits : public BitField<ElementsKind, 3, 8> {};
@@ -2881,6 +2884,7 @@ class StoreElementStub : public PlatformCodeStub {
   }
 
   Code::Kind GetCodeKind() const override { return Code::HANDLER; }
+  ExtraICState GetExtraICState() const override { return Code::KEYED_STORE_IC; }
 
  private:
   ElementsKind elements_kind() const {
@@ -2985,6 +2989,7 @@ class ElementsTransitionAndStoreStub : public HydrogenCodeStub {
 
   CallInterfaceDescriptor GetCallInterfaceDescriptor() const override;
   Code::Kind GetCodeKind() const override { return Code::HANDLER; }
+  ExtraICState GetExtraICState() const override { return Code::KEYED_STORE_IC; }
 
  private:
   class FromBits : public BitField<ElementsKind, 3, 8> {};