Merge remote-tracking branch 'remotes/rth/tags/pull-hppa-20190915' into staging

Two temp live across branch fixes.

# gpg: Signature made Sun 15 Sep 2019 14:48:06 BST
# gpg:                using RSA key 7A481E78868B4DB6A85A05C064DF38E8AF7E215F
# gpg:                issuer "richard.henderson@linaro.org"
# gpg: Good signature from "Richard Henderson <richard.henderson@linaro.org>" [full]
# Primary key fingerprint: 7A48 1E78 868B 4DB6 A85A  05C0 64DF 38E8 AF7E 215F

* remotes/rth/tags/pull-hppa-20190915:
  target/hppa: prevent trashing of temporary in do_depw_sar()
  target/hppa: prevent trashing of temporary in trans_mtctl()

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