Merge remote-tracking branch 'remotes/rth/tags/pull-dt-20190312' into staging

Break out documentation to docs/devel/.
Add support for pattern groups.
Other misc cleanups for multiple decode function

Merge remote-tracking branch 'remotes/rth/tags/pull-dt-20190312' into staging

Break out documentation to docs/devel/.
Add support for pattern groups.
Other misc cleanups for multiple decode functions.

# gpg: Signature made Tue 12 Mar 2019 16:59:37 GMT
# gpg: using RSA key 64DF38E8AF7E215F
# 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-20190312:
decodetree: Properly diagnose fields overflowing an insn
decodetree: Prefix extract function names with decode_function
decodetree: Allow +- to begin a number initializing a field
decodetree: Produce clean output for an empty input file
decodetree: Add --static-decode option
test/decode: Add tests for PatternGroups
decodetree: Allow grouping of overlapping patterns
decodetree: Do not unconditionaly return from Pattern.output_code
decodetree: Ensure build_tree does not include values outside insnmask
decodetree: Document the usefulness of argument sets
decodetree: Move documentation to docs/devel/decodetree.rst
MAINTAINERS: Add scripts/decodetree.py to the TCG section

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

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test/decode: Add tests for PatternGroups

This adds one test that supposed to succeed to test deep nesting
of pattern groups which is rarely exercised by targets using decode
tree. The remaining test

test/decode: Add tests for PatternGroups

This adds one test that supposed to succeed to test deep nesting
of pattern groups which is rarely exercised by targets using decode
tree. The remaining tests exercise various fail conditions.

Signed-off-by: Bastian Koppelmann <kbastian@mail.uni-paderborn.de>
Message-Id: <20190227120217.20794-1-kbastian@mail.uni-paderborn.de>
Signed-off-by: Richard Henderson <richard.henderson@linaro.org>

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