Merge remote-tracking branch 'remotes/rth/tags/pull-dt-20200609' into staging

Add non-overlapping groups

# gpg: Signature made Tue 09 Jun 2020 17:22:17 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-dt-20200609:
  target/arm: Use a non-overlapping group for misc control
  decodetree: Drop check for less than 2 patterns in a group
  tests/decode: Test non-overlapping groups
  decodetree: Implement non-overlapping groups
  decodetree: Move semantic propagation into classes
  decodetree: Allow group covering the entire insn space
  decodetree: Split out MultiPattern from IncMultiPattern
  decodetree: Rename MultiPattern to IncMultiPattern
  decodetree: Tidy error_with_file

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