Merge remote-tracking branch 'pmaydell/tcg-aarch64.next' into staging

# By Claudio Fontana (9) and others
# Via Peter Maydell
* pmaydell/tcg-aarch64.next:
  MAINTAINERS: add tcg/aarch64 maintainer
  configure: permit compilation on arm aarch64
  tcg/aarch64: implement user mode qemu ld/st
  user-exec.c: aarch64 initial implementation of cpu_signal_handler
  tcg/aarch64: implement sign/zero extend operations
  tcg/aarch64: implement byte swap operations
  tcg/aarch64: implement AND/TEST immediate pattern
  tcg/aarch64: improve arith shifted regs operations
  tcg/aarch64: implement new TCG target for aarch64
  include/elf.h: add aarch64 ELF machine and relocs
  configure: Drop CONFIG_ATFILE test
  linux-user: Drop direct use of openat etc syscalls
  linux-user: Allow getdents to be provided by getdents64

Message-id: 1371052645-9006-1-git-send-email-peter.maydell@linaro.org
Signed-off-by: Anthony Liguori <aliguori@us.ibm.com>