tcg/s390 updates

# gpg: Signature made Thu 15 May 2014 17:24:40 BST using RSA key ID 4DD0279B
# gpg: Can't check signature: public key not found

* remotes/rth/tags/pull-tcg-s390-20140515:
  tcg-s390: Implement direct chaining of TBs
  tcg-s390: Don't force -march=z990
  tcg-s390: Improve setcond
  tcg-s390: Allow immediate operands to add2 and sub2
  tcg-s390: Implement tcg_register_jit
  tcg-s390: Use more risbg in the tlb sequence
  tcg-s390: Move ldst helpers out of line
  tcg-s390: Convert to new ldst opcodes
  tcg-s390: Integrate endianness into TCGMemOp
  tcg-s390: Convert to TCGMemOp
  tcg-s390: Fix off-by-one in wraparound andi

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