Merge remote-tracking branch 'remotes/bonzini/tags/for-upstream' into staging

Merge remote-tracking branch 'remotes/bonzini/tags/for-upstream' into staging

* exec.c use after free
* Xen 32-on-64 breakage
* missing EINTR
* naughty warning under qtest

# gpg: Signature made Wed 02 Dec 2015 12:13:55 GMT using RSA key ID 78C7AE83
# gpg: Good signature from "Paolo Bonzini <bonzini@gnu.org>"
# gpg:                 aka "Paolo Bonzini <pbonzini@redhat.com>"

* remotes/bonzini/tags/for-upstream:
  translate-all: ensure host page mask is always extended with 1's
  main-loop: suppress warnings under qtest
  qemu-char: retry g_poll on EINTR
  exec: Stop using memory after free

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