PPC: Fix CompatibleReceiverCheck.

R=joransiu@ca.ibm.com, jyan@ca.ibm.com, michael_dawson@ca.ibm.com
BUG=

Review URL: https://codereview.chromium.org/1589373002

Cr-Commit-Position: refs/heads/master@{#33339}

src/ppc/builtins-ppc.cc

@@ -1356,7 +1356,7 @@ void CompatibleReceiverCheck(MacroAssembler* masm, Register receiver,
   // End if the prototype is null or not hidden.
   __ JumpIfRoot(receiver, Heap::kNullValueRootIndex, receiver_check_failed);
   __ LoadP(map, FieldMemOperand(receiver, HeapObject::kMapOffset));
-  __ LoadP(scratch, FieldMemOperand(map, Map::kBitField3Offset));
+  __ lwz(scratch, FieldMemOperand(map, Map::kBitField3Offset));
   __ DecodeField<Map::IsHiddenPrototype>(scratch, SetRC);
   __ beq(receiver_check_failed, cr0);
   // Iterate.