Mark maps having a hidden prototype rather than maps of hidden prototypes.

src/arm64/builtins-arm64.cc

Index: src/arm64/builtins-arm64.cc
diff --git a/src/arm64/builtins-arm64.cc b/src/arm64/builtins-arm64.cc
index 9ebdfb3791f6e008d8a980f25a43d0135035440c..e772d8295846feda132e9bfac00a4dac4485c22b 100644
--- a/src/arm64/builtins-arm64.cc
+++ b/src/arm64/builtins-arm64.cc
@@ -1434,14 +1434,11 @@ static void CompatibleReceiverCheck(MacroAssembler* masm, Register receiver,
 
   // Load the next prototype.
   __ Bind(&next_prototype);
-  __ Ldr(receiver, FieldMemOperand(map, Map::kPrototypeOffset));
-  // End if the prototype is null or not hidden.
-  __ CompareRoot(receiver, Heap::kNullValueRootIndex);
-  __ B(eq, receiver_check_failed);
-  __ Ldr(map, FieldMemOperand(receiver, HeapObject::kMapOffset));
   __ Ldr(x16, FieldMemOperand(map, Map::kBitField3Offset));
-  __ Tst(x16, Operand(Map::IsHiddenPrototype::kMask));
+  __ Tst(x16, Operand(Map::HasHiddenPrototype::kMask));
   __ B(eq, receiver_check_failed);
+  __ Ldr(receiver, FieldMemOperand(map, Map::kPrototypeOffset));
+  __ Ldr(map, FieldMemOperand(receiver, HeapObject::kMapOffset));
   // Iterate.
   __ B(&prototype_loop_start);