i#493: suppress another uninit false pos from bit manip in usp10.dll
i#493: suppress another uninit false pos from bit manip in usp10.dll

SVN-Revision: 533

sigma-random/drmemory,LohithBlaze/drmemory,code4bones/drmemory,code4bones/drmemory,LohithBlaze/drmemory,sigma-random/drmemory,code4bones/drmemory,LohithBlaze/drmemory,sigma-random/drmemory,LohithBlaze/drmemory,LohithBlaze/drmemory,code4bones/drmemory,sigma-random/drmemory,sigma-random/drmemory,code4bones/drmemory