Merge remote-tracking branch 'remotes/aurel/tags/pull-sh4-next-20150612' into staging

sh4 linux-user cpu and hwcap
misc optimizations and cleanup
convert r2d to new MMIO accessor style

# gpg: Signature made Fri Jun 12 11:28:43 2015 BST using RSA key ID 1DDD8C9B
# gpg: Good signature from "Aurelien Jarno <aurelien@aurel32.net>"
# gpg:                 aka "Aurelien Jarno <aurelien@jarno.fr>"
# gpg:                 aka "Aurelien Jarno <aurel32@debian.org>"
# gpg: WARNING: This key is not certified with a trusted signature!
# gpg:          There is no indication that the signature belongs to the owner.
# Primary key fingerprint: 7746 2642 A9EF 94FD 0F77  196D BA9C 7806 1DDD 8C9B

* remotes/aurel/tags/pull-sh4-next-20150612:
  target-sh4: remove dead code
  target-sh4: factorize fmov implementation
  target-sh4: split out Q and M from of SR and optimize div1
  target-sh4: optimize negc using add2 and sub2
  target-sh4: optimize subc using sub2
  target-sh4: optimize addc using add2
  target-sh4: Split out T from SR
  target-sh4: use bit number for SR constants
  sh4/r2d: convert to new MMIO accessor style
  linux-user: Add HWCAP for SH4
  linux-user: Default sh4 to sh7785

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