Make LoadFastElementStub a HandlerStub.

BUG=

Review URL: https://codereview.chromium.org/1132493006

Cr-Commit-Position: refs/heads/master@{#28376}

src/code-stubs.cc

@@ -594,11 +594,6 @@ void JSEntryStub::FinishCode(Handle<Code> code) {
 }
 
 
-void LoadFastElementStub::InitializeDescriptor(CodeStubDescriptor* descriptor) {
-  descriptor->Initialize(FUNCTION_ADDR(KeyedLoadIC_MissFromStubFailure));
-}
-
-
 void LoadDictionaryElementStub::InitializeDescriptor(
     CodeStubDescriptor* descriptor) {
   descriptor->Initialize(FUNCTION_ADDR(KeyedLoadIC_MissFromStubFailure));

src/code-stubs.h

@@ -76,7 +76,6 @@ namespace internal {
   V(KeyedLoadGeneric)                       \
   V(LoadScriptContextField)                 \
   V(LoadDictionaryElement)                  \
-  V(LoadFastElement)                        \
   V(MegamorphicLoad)                        \
   V(NameDictionaryLookup)                   \
   V(NumberToString)                         \
@@ -95,6 +94,7 @@ namespace internal {
   /* IC Handler stubs */                    \
   V(ArrayBufferViewLoadField)               \
   V(LoadConstant)                           \
+  V(LoadFastElement)                        \
   V(LoadField)                              \
   V(KeyedLoadSloppyArguments)               \
   V(StoreField)                             \
@@ -2357,18 +2357,20 @@ class StoreScriptContextFieldStub : public ScriptContextFieldStub {
 };
 
 
-class LoadFastElementStub : public HydrogenCodeStub {
+class LoadFastElementStub : public HandlerStub {
  public:
   LoadFastElementStub(Isolate* isolate, bool is_js_array,
                       ElementsKind elements_kind,
                       bool convert_hole_to_undefined = false)
-      : HydrogenCodeStub(isolate) {
+      : HandlerStub(isolate) {
     set_sub_minor_key(
         ElementsKindBits::encode(elements_kind) |
         IsJSArrayBits::encode(is_js_array) |
         CanConvertHoleToUndefined::encode(convert_hole_to_undefined));
   }
 
+  Code::Kind kind() const override { return Code::KEYED_LOAD_IC; }
+
   bool is_js_array() const { return IsJSArrayBits::decode(sub_minor_key()); }
   bool convert_hole_to_undefined() const {
     return CanConvertHoleToUndefined::decode(sub_minor_key());
@@ -2383,14 +2385,7 @@ class LoadFastElementStub : public HydrogenCodeStub {
   class IsJSArrayBits: public BitField<bool, 8, 1> {};
   class CanConvertHoleToUndefined : public BitField<bool, 9, 1> {};
 
-  CallInterfaceDescriptor GetCallInterfaceDescriptor() override {
-    if (FLAG_vector_ics) {
-      return VectorLoadICDescriptor(isolate());
-    }
-    return LoadDescriptor(isolate());
-  }
-
-  DEFINE_HYDROGEN_CODE_STUB(LoadFastElement, HydrogenCodeStub);
+  DEFINE_HANDLER_CODE_STUB(LoadFastElement, HandlerStub);
 };