Merge remote-tracking branch 'remotes/aurel/tags/pull-tcg-mips-s390-20150803' into staging

TCG MIPS and S390 fixes for 2.4.

# gpg: Signature made Mon Aug  3 09:09:59 2015 BST using RSA key ID 1DDD8C9B
# gpg: Good signature from "Aurelien Jarno <aurelien@aurel32.net>"
# gpg:                 aka "Aurelien Jarno <aurelien@jarno.fr>"
# gpg:                 aka "Aurelien Jarno <aurel32@debian.org>"
# gpg: WARNING: This key is not certified with a trusted signature!
# gpg:          There is no indication that the signature belongs to the owner.
# Primary key fingerprint: 7746 2642 A9EF 94FD 0F77  196D BA9C 7806 1DDD 8C9B

* remotes/aurel/tags/pull-tcg-mips-s390-20150803:
  tcg/mips: fix add2
  tcg/s390x: Mask TCGMemOp appropriately for indexing
  tcg/mips: Mask TCGMemOp appropriately for indexing
  tcg/mips: fix TLB loading for BE host with 32-bit guests

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