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

src/ppc/builtins-ppc.cc

Index: src/ppc/builtins-ppc.cc
diff --git a/src/ppc/builtins-ppc.cc b/src/ppc/builtins-ppc.cc
index 62845ae5b0252675b06bce6b6de20417ed9bc19a..88bc143761eb20115af4e229e806c38dddfa2c6b 100644
--- a/src/ppc/builtins-ppc.cc
+++ b/src/ppc/builtins-ppc.cc
@@ -1469,13 +1469,12 @@ void CompatibleReceiverCheck(MacroAssembler* masm, Register receiver,
 
   // Load the next prototype.
   __ bind(&next_prototype);
-  __ LoadP(receiver, FieldMemOperand(map, Map::kPrototypeOffset));
-  // End if the prototype is null or not hidden.
-  __ JumpIfRoot(receiver, Heap::kNullValueRootIndex, receiver_check_failed);
-  __ LoadP(map, FieldMemOperand(receiver, HeapObject::kMapOffset));
   __ lwz(scratch, FieldMemOperand(map, Map::kBitField3Offset));
   __ DecodeField<Map::IsHiddenPrototype>(scratch, SetRC);
   __ beq(receiver_check_failed, cr0);
+
+  __ LoadP(receiver, FieldMemOperand(map, Map::kPrototypeOffset));
+  __ LoadP(map, FieldMemOperand(receiver, HeapObject::kMapOffset));
   // Iterate.
   __ b(&prototype_loop_start);