Merge remote-tracking branch 'remotes/rth-gitlab/tags/pull-tcg-20210202' into staging

TCG backend constraints cleanup

# gpg: Signature made Tue 02 Feb 2021 22:59:19 GMT
# gpg:                using RSA key 7A481E78868B4DB6A85A05C064DF38E8AF7E215F
# gpg:                issuer "richard.henderson@linaro.org"
# gpg: Good signature from "Richard Henderson <richard.henderson@linaro.org>" [full]
# Primary key fingerprint: 7A48 1E78 868B 4DB6 A85A  05C0 64DF 38E8 AF7E 215F

* remotes/rth-gitlab/tags/pull-tcg-20210202: (24 commits)
  tcg: Remove TCG_TARGET_CON_SET_H
  tcg/tci: Split out constraint sets to tcg-target-con-set.h
  tcg/sparc: Split out constraint sets to tcg-target-con-set.h
  tcg/s390: Split out constraint sets to tcg-target-con-set.h
  tcg/riscv: Split out constraint sets to tcg-target-con-set.h
  tcg/ppc: Split out constraint sets to tcg-target-con-set.h
  tcg/mips: Split out constraint sets to tcg-target-con-set.h
  tcg/arm: Split out constraint sets to tcg-target-con-set.h
  tcg/aarch64: Split out constraint sets to tcg-target-con-set.h
  tcg/i386: Split out constraint sets to tcg-target-con-set.h
  tcg: Remove TCG_TARGET_CON_STR_H
  tcg/sparc: Split out target constraints to tcg-target-con-str.h
  tcg/s390: Split out target constraints to tcg-target-con-str.h
  tcg/riscv: Split out target constraints to tcg-target-con-str.h
  tcg/mips: Split out target constraints to tcg-target-con-str.h
  tcg/tci: Split out target constraints to tcg-target-con-str.h
  tcg/ppc: Split out target constraints to tcg-target-con-str.h
  tcg/aarch64: Split out target constraints to tcg-target-con-str.h
  tcg/arm: Split out target constraints to tcg-target-con-str.h
  tcg/i386: Split out target constraints to tcg-target-con-str.h
  ...

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