Merge remote-tracking branch 'remotes/rth/tags/pull-tcg-20150824' into staging

queued tcg patches

# gpg: Signature made Mon 24 Aug 2015 19:37:15 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-20150824:
  linux-user: remove useless macros GUEST_BASE and RESERVED_VA
  linux-user: remove --enable-guest-base/--disable-guest-base
  tcg/aarch64: Use softmmu fast path for unaligned accesses
  tcg/s390: Use softmmu fast path for unaligned accesses
  tcg/ppc: Improve unaligned load/store handling on 64-bit backend
  tcg/i386: use softmmu fast path for unaligned accesses
  tcg: Remove tcg_gen_trunc_i64_i32
  tcg: Split trunc_shr_i32 opcode into extr[lh]_i64_i32
  tcg: update README about size changing ops
  tcg/optimize: add optimizations for ext_i32_i64 and extu_i32_i64 ops
  tcg: implement real ext_i32_i64 and extu_i32_i64 ops
  tcg: don't abuse TCG type in tcg_gen_trunc_shr_i64_i32
  tcg: rename trunc_shr_i32 into trunc_shr_i64_i32
  tcg/optimize: allow constant to have copies
  tcg/optimize: track const/copy status separately
  tcg/optimize: add temp_is_const and temp_is_copy functions
  tcg/optimize: optimize temps tracking
  tcg/optimize: fix constant signedness

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

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