Merge remote-tracking branch 'remotes/rth/tags/pull-atomic-20161026' into staging

cmpxchg emulation of atomics, v8

# gpg: Signature made Wed 26 Oct 2016 16:30:03 BST
# gpg:                using RSA key 0xAD1270CC4DD0279B
# gpg: Good signature from "Richard Henderson <rth7680@gmail.com>"
# gpg:                 aka "Richard Henderson <rth@redhat.com>"
# gpg:                 aka "Richard Henderson <rth@twiddle.net>"
# Primary key fingerprint: 9CB1 8DDA F8E8 49AD 2AFC  16A4 AD12 70CC 4DD0 279B

* remotes/rth/tags/pull-atomic-20161026: (37 commits)
  target-alpha: Emulate LL/SC using cmpxchg helpers
  target-alpha: Introduce MMU_PHYS_IDX
  target-arm: remove EXCP_STREX + cpu_exclusive_{test, info}
  linux-user: remove handling of aarch64's EXCP_STREX
  linux-user: remove handling of ARM's EXCP_STREX
  target-arm: emulate aarch64's LL/SC using cmpxchg helpers
  target-arm: emulate SWP with atomic_xchg helper
  target-arm: emulate LL/SC using cmpxchg helpers
  target-arm: Rearrange aa32 load and store functions
  tests: add atomic_add-bench
  target-i386: remove helper_lock()
  target-i386: emulate XCHG using atomic helper
  target-i386: emulate LOCK'ed BTX ops using atomic helpers
  target-i386: emulate LOCK'ed XADD using atomic helper
  target-i386: emulate LOCK'ed NEG using cmpxchg helper
  target-i386: emulate LOCK'ed NOT using atomic helper
  target-i386: emulate LOCK'ed INC using atomic helper
  target-i386: emulate LOCK'ed OP instructions using atomic helpers
  target-i386: emulate LOCK'ed cmpxchg using cmpxchg helpers
  tcg: Emit barriers with parallel_cpus
  ...

Signed-off-by: Peter Maydell <peter.maydell@linaro.org>

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