Merge remote-tracking branch 'remotes/rth/tags/pull-tcg-20200903' into staging

Improve inlining in cputlb.c.
Fix vector abs fallback.
Only set parallel_cpus for SMP.
Add vector dupm for 256-bit elements.

# gpg: Signature made Thu 03 Sep 2020 22:38:25 BST
# 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/tags/pull-tcg-20200903:
  tcg: Implement 256-bit dup for tcg_gen_gvec_dup_mem
  tcg: Eliminate one store for in-place 128-bit dup_mem
  softmmu/cpus: Only set parallel_cpus for SMP
  tcg: Fix tcg gen for vectorized absolute value
  cputlb: Make store_helper less fragile to compiler optimizations

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