[ic] Remove deprecated LoadConstantStub and other related dead code

src/code-stubs.h

Index: src/code-stubs.h
diff --git a/src/code-stubs.h b/src/code-stubs.h
index 3134d4cee1a7bc45ef20b321dbff4bdc7cf783cb..12110a82204629858a64b554604cd91ed7b76829 100644
--- a/src/code-stubs.h
+++ b/src/code-stubs.h
@@ -67,7 +67,6 @@ class Node;
   /* These will be ported/eliminated */       \
   /* as part of the new IC system, ask */     \
   /* ishell before doing anything  */         \
-  V(LoadConstant)                             \
   V(LoadField)                                \
   /* These should never be ported to TF */    \
   /* because they are either used only by */  \
@@ -1229,29 +1228,6 @@ class KeyedStoreSloppyArgumentsStub : public TurboFanCodeStub {
   DEFINE_TURBOFAN_CODE_STUB(KeyedStoreSloppyArguments, TurboFanCodeStub);
 };
 
-
-class LoadConstantStub : public HandlerStub {
- public:
-  LoadConstantStub(Isolate* isolate, int constant_index)
-      : HandlerStub(isolate) {
-    set_sub_minor_key(ConstantIndexBits::encode(constant_index));
-  }
-
-  int constant_index() const {
-    return ConstantIndexBits::decode(sub_minor_key());
-  }
-
- protected:
-  Code::Kind kind() const override { return Code::LOAD_IC; }
-
- private:
-  class ConstantIndexBits : public BitField<int, 0, kSubMinorKeyBits> {};
-
-  // TODO(ishell): The stub uses only kReceiver parameter.
-  DEFINE_CALL_INTERFACE_DESCRIPTOR(LoadWithVector);
-  DEFINE_HANDLER_CODE_STUB(LoadConstant, HandlerStub);
-};
-
 class LoadApiGetterStub : public TurboFanCodeStub {
  public:
   LoadApiGetterStub(Isolate* isolate, bool receiver_is_holder, int index)