Merge remote-tracking branch 'remotes/lalrae/tags/mips-20160923' into staging

MIPS patches 2016-09-23

Changes:
* 24KEc CPU definition
* SYNC instructions make use of tcg memory barrier ops
* various MIPS linux-user bug fixes

# gpg: Signature made Fri 23 Sep 2016 08:09:08 BST
# gpg:                using RSA key 0x52118E3C0B29DA6B
# gpg: Good signature from "Leon Alrae <leon.alrae@imgtec.com>"
# Primary key fingerprint: 8DD3 2F98 5495 9D66 35D4  4FC0 5211 8E3C 0B29 DA6B

* remotes/lalrae/tags/mips-20160923:
  linux-user: Add missing Mips syscalls items in strace.list
  linux-user: Add missing TARGET_EDQUOT error code for Mips
  linux-user: Fix certain argument alignment cases for Mips64
  linux-user: Fix structure target_semid64_ds definition for Mips
  linux-user: Fix structure target_flock definition for Mips
  linux-user: Fix TARGET_F_GETOWN definition for Mips
  linux-user: Fix TARGET_SIOCATMARK definition for Mips
  target-mips: generate fences
  target-mips: add 24KEc CPU definition

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