Merge remote-tracking branch 'remotes/rth/tags/pull-tcg-20150723' into staging

Last minute fixes for 2.4.

# gpg: Signature made Fri Jul 24 04:42:31 2015 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-20150723:
  tcg/optimize: fix tcg_opt_gen_movi
  tcg/aarch64: use 32-bit offset for 32-bit softmmu emulation
  tcg/aarch64: use 32-bit offset for 32-bit user-mode emulation
  tcg/aarch64: add ext argument to tcg_out_insn_3310
  tcg/i386: Extend addresses for 32-bit guests

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