Merge remote-tracking branch 'aurel32/tags/pull-tcg-mips-20170506' into staging

Fix MIPS R2 hosts support

# gpg: Signature made Sat 06 May 2017 06:56:28 AM EDT
# gpg:                using RSA key 0xBA9C78061DDD8C9B
# gpg: Good signature from "Aurelien Jarno <aurelien@aurel32.net>"
# gpg:                 aka "Aurelien Jarno <aurelien@jarno.fr>"
# gpg:                 aka "Aurelien Jarno <aurel32@debian.org>"
# Primary key fingerprint: 7746 2642 A9EF 94FD 0F77  196D BA9C 7806 1DDD 8C9B

* aurel32/tags/pull-tcg-mips-20170506:
  tcg/mips: fix field extraction opcode

Signed-off-by: Stefan Hajnoczi <stefanha@redhat.com>