Properly set up the code flags of the turbofan interceptor stubs.

src/code-stubs.h

Index: src/code-stubs.h
diff --git a/src/code-stubs.h b/src/code-stubs.h
index e70b47f40826a41b8532b02d557052760f84ae31..c08681b60ba1646b04e6a2843842b81d5f94e22f 100644
--- a/src/code-stubs.h
+++ b/src/code-stubs.h
@@ -875,6 +875,8 @@ class StoreInterceptorStub : public TurboFanCodeStub {
   void GenerateAssembly(compiler::CodeStubAssembler* assember) const override;
 
   Code::Kind GetCodeKind() const override { return Code::HANDLER; }
+  ExtraICState GetExtraICState() const override { return Code::STORE_IC; }
+  InlineCacheState GetICState() const override { return MONOMORPHIC; }
 
   DEFINE_CALL_INTERFACE_DESCRIPTOR(Store);
   DEFINE_CODE_STUB(StoreInterceptor, TurboFanCodeStub);
@@ -886,6 +888,8 @@ class LoadIndexedInterceptorStub : public TurboFanCodeStub {
       : TurboFanCodeStub(isolate) {}
 
   Code::Kind GetCodeKind() const override { return Code::HANDLER; }
+  ExtraICState GetExtraICState() const override { return Code::KEYED_LOAD_IC; }
+  InlineCacheState GetICState() const override { return MONOMORPHIC; }
 
   DEFINE_CALL_INTERFACE_DESCRIPTOR(LoadWithVector);
   DEFINE_TURBOFAN_CODE_STUB(LoadIndexedInterceptor, TurboFanCodeStub);