pass in xsp and avoid dr_get_mcontext altogether in pre hook since it only needs xsp (for 32-bit where params are all on stack)
pass in xsp and avoid dr_get_mcontext altogether in pre hook
since it only needs xsp (for 32-bit where params are all on stack)

SVN-Revision: 668

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