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

src/mips64/builtins-mips64.cc

Index: src/mips64/builtins-mips64.cc
diff --git a/src/mips64/builtins-mips64.cc b/src/mips64/builtins-mips64.cc
index cf9d747166bac0ce902acb3646ddac0102c19a02..6a2924cdb910fe07b49528147af76de1ab97a585 100644
--- a/src/mips64/builtins-mips64.cc
+++ b/src/mips64/builtins-mips64.cc
@@ -1463,13 +1463,12 @@ static void CompatibleReceiverCheck(MacroAssembler* masm, Register receiver,
 
   // Load the next prototype.
   __ bind(&next_prototype);
-  __ ld(receiver, FieldMemOperand(map, Map::kPrototypeOffset));
-  // End if the prototype is null or not hidden.
-  __ JumpIfRoot(receiver, Heap::kNullValueRootIndex, receiver_check_failed);
-  __ ld(map, FieldMemOperand(receiver, HeapObject::kMapOffset));
   __ lwu(scratch, FieldMemOperand(map, Map::kBitField3Offset));
-  __ DecodeField<Map::IsHiddenPrototype>(scratch);
+  __ DecodeField<Map::HasHiddenPrototype>(scratch);
   __ Branch(receiver_check_failed, eq, scratch, Operand(zero_reg));
+
+  __ ld(receiver, FieldMemOperand(map, Map::kPrototypeOffset));
+  __ ld(map, FieldMemOperand(receiver, HeapObject::kMapOffset));
   // Iterate.
   __ Branch(&prototype_loop_start);