Merge remote-tracking branch 'remotes/rth/tags/pull-tcg-20211013' into staging

Use MO_128 for 16-byte atomic memory operations.
Add cpu_ld/st_mmu memory primitives.
Move helper_ld/st memory helpers out of tcg.h.
Canonicalize alignment flags in MemOp.

# gpg: Signature made Wed 13 Oct 2021 10:48:45 AM PDT
# gpg:                using RSA key 7A481E78868B4DB6A85A05C064DF38E8AF7E215F
# gpg:                issuer "richard.henderson@linaro.org"
# gpg: Good signature from "Richard Henderson <richard.henderson@linaro.org>" [ultimate]

* remotes/rth/tags/pull-tcg-20211013:
  tcg: Canonicalize alignment flags in MemOp
  tcg: Move helper_*_mmu decls to tcg/tcg-ldst.h
  target/arm: Use cpu_*_mmu instead of helper_*_mmu
  target/sparc: Use cpu_*_mmu instead of helper_*_mmu
  target/s390x: Use cpu_*_mmu instead of helper_*_mmu
  target/mips: Use 8-byte memory ops for msa load/store
  target/mips: Use cpu_*_data_ra for msa load/store
  accel/tcg: Move cpu_atomic decls to exec/cpu_ldst.h
  accel/tcg: Add cpu_{ld,st}*_mmu interfaces
  target/hexagon: Implement cpu_mmu_index
  target/s390x: Use MO_128 for 16 byte atomics
  target/ppc: Use MO_128 for 16 byte atomics
  target/i386: Use MO_128 for 16 byte atomics
  target/arm: Use MO_128 for 16 byte atomics
  memory: Log access direction for invalid accesses

Signed-off-by: Richard Henderson <richard.henderson@linaro.org>