Merge remote-tracking branch 'remotes/amarkovic2/tags/mips-queue-jul-23-2019' into staging

MIPS queue for July 23rd, 2019

# gpg: Signature made Mon 22 Jul 2019 18:34:29 BST
# gpg:                using RSA key D4972A8967F75A65
# gpg: Good signature from "Aleksandar Markovic <amarkovic@wavecomp.com>" [unknown]
# 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: 8526 FBF1 5DA3 811F 4A01  DD75 D497 2A89 67F7 5A65

* remotes/amarkovic2/tags/mips-queue-jul-23-2019:
  target/mips: Fix emulation of MSA pack instructions on big endian hosts
  target/mips: Add 'fall through' comments for handling nanoMips' SHXS, SWXS

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