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This patch fixes the p{readv,writev}{64} consolidation implementation from commits 4e77815 and af5fdf5. Different from pread/pwrite implementation, preadv/pwritev implementation does not require __ALIGNMENT_ARG because kernel syscall prototypes define the high and low part of the off_t, if it is the case, directly (different from pread/pwrite where the architecture ABI for passing 64-bit values must be in consideration for passsing the arguments). It also adds some basic tests for preadv/pwritev. Tested on x86_64, i686, and armhf. * misc/Makefile (tests): Add tst-preadvwritev and tst-preadvwritev64. * misc/tst-preadvwritev.c: New file. * misc/tst-preadvwritev64.c: Likewise. * sysdeps/unix/sysv/linux/preadv.c (preadv): Remove SYSCALL_LL{64} usage. * sysdeps/unix/sysv/linux/preadv64.c (preadv64): Likewise. * sysdeps/unix/sysv/linux/pwritev.c (pwritev): Likewise. * sysdeps/unix/sysv/linux/pwritev64.c (pwritev64): Likewise. * sysdeps/unix/sysv/linux/sysdep.h (LO_HI_LONG): New macro.