[csa] Add IsArrayProtectorCellInvalid utility method

Change-Id: I8ecca14e1d65aeed59cd55626e41f9863d58be50
Reviewed-on: https://chromium-review.googlesource.com/589431
Commit-Queue: Benedikt Meurer <bmeurer@chromium.org>
Reviewed-by: Benedikt Meurer <bmeurer@chromium.org>
Cr-Commit-Position: refs/heads/master@{#46955}

src/builtins/builtins-array-gen.cc

@@ -2230,10 +2230,7 @@ TF_BUILTIN(ArrayIteratorPrototypeNext, CodeStubAssembler) {
     BIND(&holey_object_values);
     {
       // Check the array_protector cell, and take the slow path if it's invalid.
-      Node* invalid = SmiConstant(Isolate::kProtectorInvalid);
-      Node* cell = LoadRoot(Heap::kArrayProtectorRootIndex);
-      Node* cell_value = LoadObjectField(cell, PropertyCell::kValueOffset);
-      GotoIf(WordEqual(cell_value, invalid), &generic_values);
+      GotoIf(IsArrayProtectorCellInvalid(), &generic_values);
 
       var_value.Bind(UndefinedConstant());
       Node* value = LoadFixedArrayElement(elements, index, 0, SMI_PARAMETERS);
@@ -2245,10 +2242,7 @@ TF_BUILTIN(ArrayIteratorPrototypeNext, CodeStubAssembler) {
     BIND(&holey_double_values);
     {
       // Check the array_protector cell, and take the slow path if it's invalid.
-      Node* invalid = SmiConstant(Isolate::kProtectorInvalid);
-      Node* cell = LoadRoot(Heap::kArrayProtectorRootIndex);
-      Node* cell_value = LoadObjectField(cell, PropertyCell::kValueOffset);
-      GotoIf(WordEqual(cell_value, invalid), &generic_values);
+      GotoIf(IsArrayProtectorCellInvalid(), &generic_values);
 
       var_value.Bind(UndefinedConstant());
       Node* value = LoadFixedDoubleArrayElement(

src/code-stub-assembler.cc

@@ -3405,6 +3405,13 @@ Node* CodeStubAssembler::IsUndetectableMap(Node* map) {
   return IsSetWord32(LoadMapBitField(map), 1 << Map::kIsUndetectable);
 }
 
+Node* CodeStubAssembler::IsArrayProtectorCellInvalid() {
+  Node* invalid = SmiConstant(Isolate::kProtectorInvalid);
+  Node* cell = LoadRoot(Heap::kArrayProtectorRootIndex);
+  Node* cell_value = LoadObjectField(cell, PropertyCell::kValueOffset);
+  return WordEqual(cell_value, invalid);
+}
+
 Node* CodeStubAssembler::IsCallable(Node* object) {
   return IsCallableMap(LoadMap(object));
 }

src/code-stub-assembler.h

@@ -877,6 +877,7 @@ class V8_EXPORT_PRIVATE CodeStubAssembler : public compiler::CodeAssembler {
   Node* IsUnseededNumberDictionary(Node* object);
   Node* IsWeakCell(Node* object);
   Node* IsUndetectableMap(Node* map);
+  Node* IsArrayProtectorCellInvalid();
 
   // True iff |object| is a Smi or a HeapNumber.
   Node* IsNumber(Node* object);