PPC/S390: Use Load Byte to fix endianess issue

src/builtins/s390/builtins-s390.cc

 // Copyright 2014 the V8 project authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #if V8_TARGET_ARCH_S390
 
 #include "src/codegen.h"
 #include "src/debug/debug.h"
 #include "src/deoptimizer.h"
 #include "src/full-codegen/full-codegen.h"
@@ skipping 2804 matching lines @@
   __ LoadP(scratch, FieldMemOperand(scratch, HeapObject::kMapOffset));
   __ LoadP(scratch2,
            ContextMemOperand(
                scratch2, Context::INITIAL_ARRAY_ITERATOR_PROTOTYPE_MAP_INDEX));
   __ CmpP(scratch, scratch2);
   __ bne(&runtime_call);
 
   // For FastPacked kinds, iteration will have the same effect as simply
   // accessing each property in order.
   Label no_protector_check;
-  __ LoadP(scratch, FieldMemOperand(spread_map, Map::kBitField2Offset));
+  __ LoadlB(scratch, FieldMemOperand(spread_map, Map::kBitField2Offset));
   __ DecodeField<Map::ElementsKindBits>(scratch);
   __ CmpP(scratch, Operand(FAST_HOLEY_ELEMENTS));
   __ bgt(&runtime_call);
   // For non-FastHoley kinds, we can skip the protector check.
   __ CmpP(scratch, Operand(FAST_SMI_ELEMENTS));
   __ beq(&no_protector_check);
   __ CmpP(scratch, Operand(FAST_ELEMENTS));
   __ beq(&no_protector_check);
   // Check the ArrayProtector cell.
   __ LoadRoot(scratch, Heap::kArrayProtectorRootIndex);
@@ skipping 381 matching lines @@
     __ bkpt(0);
   }
 }
 
 #undef __
 
 }  // namespace internal
 }  // namespace v8
 
 #endif  // V8_TARGET_ARCH_S390