message: fix the warning on hcc
diff: @@ -885,8 +885,13 @@ namespace StockhamGenerator
  str += "\tunsigned int rw = 1;\n\n";
  }
  -
  - str += "\t(void)(rw == rw);\n";//suppress warning; when rw=1, generator directly puts 1 as the pass device function
  + //The following lines suppress warning; when rw=1, generator directly puts 1 as the pass device function
  + str += "\t//suppress warning\n";
  + str += "\t#ifdef __NVCC__\n";
  + str += "\t\t(void)(rw == rw);\n";
  + str += "\t#else\n";
  + str += "\t\t(void)rw;\n";
  + str += "\t#endif\n";
  // Transform index for 3-step twiddles
  