Merge remote-tracking branch 'remotes/rth/tags/pull-tcg-20150902' into staging

queued tcg patches

# gpg: Signature made Wed 02 Sep 2015 22:35:37 BST using RSA key ID 4DD0279B
# gpg: Good signature from "Richard Henderson <rth7680@gmail.com>"
# gpg:                 aka "Richard Henderson <rth@redhat.com>"
# gpg:                 aka "Richard Henderson <rth@twiddle.net>"

* remotes/rth/tags/pull-tcg-20150902:
  tcg/i386: omit a few REXW prefixes in softmmu code
  tcg/aarch64: Fix tcg_out_qemu_{ld, st} for guest_base == 0

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