Merge remote-tracking branch 'remotes/rth/tags/pull-tcg-20171010' into staging

Queued TCG patches

# gpg: Signature made Tue 10 Oct 2017 20:23:12 BST
# gpg:                using RSA key 0x64DF38E8AF7E215F
# gpg: Good signature from "Richard Henderson <richard.henderson@linaro.org>"
# Primary key fingerprint: 7A48 1E78 868B 4DB6 A85A  05C0 64DF 38E8 AF7E 215F

* remotes/rth/tags/pull-tcg-20171010:
  tcg/mips: delete commented out extern keyword.
  tcg: define TCG_HIGHWATER
  util: move qemu_real_host_page_size/mask to osdep.h
  tcg: take .helpers out of TCGContext
  tci: move tci_regs to tcg_qemu_tb_exec's stack
  exec-all: extract tb->tc_* into a separate struct tc_tb
  translate-all: define and use DEBUG_TB_CHECK_GATE
  translate-all: define and use DEBUG_TB_INVALIDATE_GATE
  exec-all: introduce TB_PAGE_ADDR_FMT
  translate-all: define and use DEBUG_TB_FLUSH_GATE
  exec-all: bring tb->invalid into tb->cflags
  tcg: consolidate TB lookups in tb_lookup__cpu_state
  tcg: remove addr argument from lookup_tb_ptr
  tcg/mips: constify tcg_target_callee_save_regs
  tcg/i386: constify tcg_target_callee_save_regs
  cpu-exec: rename have_tb_lock to acquired_tb_lock in tb_find
  translate-all: make have_tb_lock static
  exec-all: fix typos in TranslationBlock's documentation
  tcg: fix corruption of code_time profiling counter upon tb_flush
  cputlb: bring back tlb_flush_count under !TLB_DEBUG

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