Merge remote-tracking branch 'rth/tcg-ppc-pull' into staging

Merge remote-tracking branch 'rth/tcg-ppc-pull' into staging

# By Richard Henderson (19) and Paolo Bonzini (2)
# Via Richard Henderson
* rth/tcg-ppc-pull: (21 commits)
  tcg-ppc64: Implement CONFIG_QEMU_LDST_OPTIMIZATION
  tcg-ppc64: Add _noaddr functions for emitting forward branches
  tcg-ppc64: Streamline tcg_out_tlb_read
  tcg-ppc64: Implement tcg_register_jit
  tcg-ppc64: Handle long offsets better
  tcg-ppc64: Tidy register allocation order
  tcg-ppc64: Look through a constant function descriptor
  tcg-ppc64: Fold constant call address into descriptor load
  tcg-ppc64: Don't load the static chain from TCG
  tcg-ppc64: Avoid code for nop move
  tcg-ppc64: Use tcg_out64
  tcg-ppc64: Use TCG_REG_Rn constants
  tcg-ppc64: More use of TAI and SAI helper macros
  tcg-ppc64: Reformat tcg-target.c
  tcg-ppc: Fix and cleanup tcg_out_tlb_check
  tcg-ppc: Use conditional branch and link to slow path
  tcg-ppc: Cleanup tcg_out_qemu_ld/st_slow_path
  tcg-ppc: Avoid code for nop move
  tcg-ppc: use new return-argument ld/st helpers
  tcg-ppc: fix qemu_ld/qemu_st for AIX ABI
  ...

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