[CSA] Avoid sign-extending LoadIC's Smi handler when possible

Smi handler in LoadIC is decoded to IntPtrT and result in
sign-extending Smi's value when pointer compression is enabled. This
CL avoid this sign-extension by decoding the Smi to Int32T.

Change-Id: I3ddd6dcec8654d6c13d472a077a55698359d126a
Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/3740481
Commit-Queue: Hao A Xu <hao.a.xu@intel.com>
Reviewed-by: Igor Sheludko <ishell@chromium.org>
Cr-Commit-Position: refs/heads/main@{#81525}

src/ic/accessor-assembler.h

@@ -379,15 +379,16 @@ class V8_EXPORT_PRIVATE AccessorAssembler : public CodeStubAssembler {
 
   void HandleLoadCallbackProperty(const LazyLoadICParameters* p,
                                   TNode<JSObject> holder,
-                                  TNode<WordT> handler_word,
+                                  TNode<Word32T> handler_word,
                                   ExitPoint* exit_point);
 
   void HandleLoadAccessor(const LazyLoadICParameters* p,
                           TNode<CallHandlerInfo> call_handler_info,
-                          TNode<WordT> handler_word, TNode<DataHandler> handler,
-                          TNode<IntPtrT> handler_kind, ExitPoint* exit_point);
+                          TNode<Word32T> handler_word,
+                          TNode<DataHandler> handler,
+                          TNode<Uint32T> handler_kind, ExitPoint* exit_point);
 
-  void HandleLoadField(TNode<JSObject> holder, TNode<WordT> handler_word,
+  void HandleLoadField(TNode<JSObject> holder, TNode<Word32T> handler_word,
                        TVariable<Float64T>* var_double_value,
                        Label* rebox_double, Label* miss, ExitPoint* exit_point);
 
@@ -398,7 +399,8 @@ class V8_EXPORT_PRIVATE AccessorAssembler : public CodeStubAssembler {
                            TVariable<Float64T>* var_double_value,
                            Label* rebox_double, ExitPoint* exit_point);
 
-  void HandleLoadWasmField(TNode<WasmObject> holder, TNode<WordT> handler_word,
+  void HandleLoadWasmField(TNode<WasmObject> holder,
+                           TNode<Word32T> handler_word,
                            TVariable<Float64T>* var_double_value,
                            Label* rebox_double, ExitPoint* exit_point);
 #endif  // V8_ENABLE_WEBASSEMBLY
@@ -409,14 +411,14 @@ class V8_EXPORT_PRIVATE AccessorAssembler : public CodeStubAssembler {
 
   void HandleLoadICSmiHandlerLoadNamedCase(
       const LazyLoadICParameters* p, TNode<Object> holder,
-      TNode<IntPtrT> handler_kind, TNode<WordT> handler_word,
+      TNode<Uint32T> handler_kind, TNode<Word32T> handler_word,
       Label* rebox_double, TVariable<Float64T>* var_double_value,
       TNode<Object> handler, Label* miss, ExitPoint* exit_point, ICMode ic_mode,
       OnNonExistent on_nonexistent, ElementSupport support_elements);
 
   void HandleLoadICSmiHandlerHasNamedCase(const LazyLoadICParameters* p,
                                           TNode<Object> holder,
-                                          TNode<IntPtrT> handler_kind,
+                                          TNode<Uint32T> handler_kind,
                                           Label* miss, ExitPoint* exit_point,
                                           ICMode ic_mode);