Merge remote-tracking branch 'remotes/rth/tags/pull-tcg-20150727' into staging

Fix buglets for 2.4

# gpg: Signature made Mon Jul 27 15:26:48 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-20150727:
  tcg: mark temps as mem_coherent = 0 for mov with a constant
  tcg: correctly mark dead inputs for mov with a constant

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