Merge remote-tracking branch 'remotes/rth/tags/pull-tcg-20150609' into staging

Collected TCG patches

# gpg: Signature made Tue Jun  9 15:06:18 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-20150609:
  tcg/optimize: rename tcg_constant_folding
  tcg/optimize: fold constant test in tcg_opt_gen_mov
  tcg/optimize: fold temp copies test in tcg_opt_gen_mov
  tcg/optimize: remove opc argument from tcg_opt_gen_mov
  tcg/optimize: remove opc argument from tcg_opt_gen_movi
  tcg: fix dead computation for repeated input arguments
  tcg: fix register allocation with two aliased dead inputs
  tcg: Handle MO_AMASK in tcg_dump_ops
  tcg: Mask TCGMemOp appropriately for indexing

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