Convert checksum.S to new ML compatible syntax. Resulting obj was compared and is identical to trunk (both GAS and ML) svn path=/branches/cmake-bringup/; revision=50545
sync with trunk (r49230) svn path=/branches/cmake-bringup/; revision=49246
Sync with trunk head (r48826) svn path=/branches/cmake-bringup/; revision=48831
svn path=/branches/cmake-bringup/; revision=48236