Clean up the usage of V8_TARGET_ARCH_${arch} and V8_HOST_ARCH_${arch}

src/hydrogen-instructions.cc

 // Copyright 2012 the V8 project authors. All rights reserved.
 // Redistribution and use in source and binary forms, with or without
 // modification, are permitted provided that the following conditions are
 // met:
 //
 //     * Redistributions of source code must retain the above copyright
 //       notice, this list of conditions and the following disclaimer.
 //     * Redistributions in binary form must reproduce the above
 //       copyright notice, this list of conditions and the following
 //       disclaimer in the documentation and/or other materials provided
@@ skipping 1541 matching lines @@
       HValue* new_left = SimplifiedDividendForMathFloorOfDiv(left);
       if (new_left == NULL &&
           hdiv->observed_input_representation(1).IsSmiOrInteger32()) {
         new_left = new(block()->zone())
             HChange(left, Representation::Integer32(), false, false);
         HChange::cast(new_left)->InsertBefore(this);
       }
       HValue* new_right =
           LChunkBuilder::SimplifiedDivisorForMathFloorOfDiv(right);
       if (new_right == NULL &&
-#ifdef V8_TARGET_ARCH_ARM
+#if V8_TARGET_ARCH_ARM
           CpuFeatures::IsSupported(SUDIV) &&
 #endif
           hdiv->observed_input_representation(2).IsSmiOrInteger32()) {
         new_right = new(block()->zone())
             HChange(right, Representation::Integer32(), false, false);
         HChange::cast(new_right)->InsertBefore(this);
       }
 
       // Return if left or right are not optimizable.
       if ((new_left == NULL) || (new_right == NULL)) return this;
@@ skipping 2305 matching lines @@
     case kBackingStore:
       if (!name_.is_null()) stream->Add(*String::cast(*name_)->ToCString());
       stream->Add("[backing-store]");
       break;
   }
 
   stream->Add("@%d", offset());
 }
 
 } }  // namespace v8::internal