[promises] Simplify PromiseSetHasHandler

src/builtins/builtins-promise.cc

Index: src/builtins/builtins-promise.cc
diff --git a/src/builtins/builtins-promise.cc b/src/builtins/builtins-promise.cc
index 46f6043bd3c85350d81ea25da6940d0219a4b0ef..c0411d90f56aad1a87b5749e95660aba36b7c3b7 100644
--- a/src/builtins/builtins-promise.cc
+++ b/src/builtins/builtins-promise.cc
@@ -94,11 +94,10 @@ Node* PromiseBuiltinsAssembler::PromiseHasHandler(Node* promise) {
 }
 
 void PromiseBuiltinsAssembler::PromiseSetHasHandler(Node* promise) {
-  Node* const flags =
-      SmiUntag(LoadObjectField(promise, JSPromise::kFlagsOffset));
+  Node* const flags = LoadObjectField(promise, JSPromise::kFlagsOffset);
   Node* const new_flags =
-      WordOr(flags, IntPtrConstant(1 << JSPromise::kHasHandlerBit));
-  StoreObjectField(promise, JSPromise::kFlagsOffset, SmiTag(new_flags));
+      SmiOr(flags, SmiConstant(1 << JSPromise::kHasHandlerBit));
+  StoreObjectFieldNoWriteBarrier(promise, JSPromise::kFlagsOffset, new_flags);
 }
 
 Node* PromiseBuiltinsAssembler::SpeciesConstructor(Node* context, Node* object,