Merge remote-tracking branch 'remotes/pmaydell/tags/pull-target-arm-20200804' into staging

target-arm queue:
 * Fix decode of LDRA[AB] instructions
 * docs/devel: Document decodetree no-overlap groups

# gpg: Signature made Tue 04 Aug 2020 17:08:11 BST
# gpg:                using RSA key E1A5C593CD419DE28E8315CF3C2525ED14360CDE
# gpg:                issuer "peter.maydell@linaro.org"
# gpg: Good signature from "Peter Maydell <peter.maydell@linaro.org>" [ultimate]
# gpg:                 aka "Peter Maydell <pmaydell@gmail.com>" [ultimate]
# gpg:                 aka "Peter Maydell <pmaydell@chiark.greenend.org.uk>" [ultimate]
# Primary key fingerprint: E1A5 C593 CD41 9DE2 8E83  15CF 3C25 25ED 1436 0CDE

* remotes/pmaydell/tags/pull-target-arm-20200804:
  target/arm: Fix decode of LDRA[AB] instructions
  docs/devel: Document decodetree no-overlap groups

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