Merge remote-tracking branch 'remotes/rth/tags/pull-tcg-20140512' into staging

tcg updates for 20140512

# gpg: Signature made Tue 13 May 2014 00:19:56 BST using RSA key ID 4DD0279B
# gpg: Can't check signature: public key not found

* remotes/rth/tags/pull-tcg-20140512: (26 commits)
  tcg: Remove unreachable code in tcg_out_op and op_defs
  tcg: Use tcg_target_available_regs in tcg_reg_alloc_mov
  tcg: Make call address a constant parameter
  tci: Create tcg_out_call
  tcg-mips: Split out tcg_out_call
  tcg-sparc: Create tcg_out_call
  tcg-ppc64: Rename tcg_out_calli to tcg_out_call
  tcg-ppc: Split out tcg_out_call
  tcg-s390: Rename tgen_calli to tcg_out_call
  tcg-i386: Rename tcg_out_calli to tcg_out_call
  tcg: Require TCG_TARGET_INSN_UNIT_SIZE
  tci: Define TCG_TARGET_INSN_UNIT_SIZE
  tcg-mips: Define TCG_TARGET_INSN_UNIT_SIZE
  tcg-ia64: Define TCG_TARGET_INSN_UNIT_SIZE
  tcg-s390: Define TCG_TARGET_INSN_UNIT_SIZE
  tcg-aarch64: Define TCG_TARGET_INSN_UNIT_SIZE
  tcg-arm: Define TCG_TARGET_INSN_UNIT_SIZE
  tcg-sparc: Define TCG_TARGET_INSN_UNIT_SIZE
  tcg-ppc: Define TCG_TARGET_INSN_UNIT_SIZE
  tcg-ppc64: Define TCG_TARGET_INSN_UNIT_SIZE
  ...

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