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

src/full-codegen.h

 // 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 314 matching lines @@
   // is expected on the stack or the accumulator, depending on the platform.
   // See the platform-specific implementation for details.
   void DoTest(Expression* condition,
               Label* if_true,
               Label* if_false,
               Label* fall_through);
   void DoTest(const TestContext* context);
 
   // Helper function to split control flow and avoid a branch to the
   // fall-through label if it is set up.
-#ifdef V8_TARGET_ARCH_MIPS
+#if V8_TARGET_ARCH_MIPS
   void Split(Condition cc,
              Register lhs,
              const Operand&  rhs,
              Label* if_true,
              Label* if_false,
              Label* fall_through);
 #else  // All non-mips arch.
   void Split(Condition cc,
              Label* if_true,
              Label* if_false,
@@ skipping 532 matching lines @@
   }
 
  private:
   Zone* zone_;
 };
 
 
 } }  // namespace v8::internal
 
 #endif  // V8_FULL_CODEGEN_H_