I've been raking through a large work-in-progress patch from Philip

Attfield, dividing it into atomic changes and adding commit
documentation. Philip's work was a mixture of important bug fixes and
WIP to try and get gdb working better. Unfortunately some of the WIP
changes caused regressions.

This pull request includes only those changes that I am confident will
not cause regressions. In particular it includes an number of important
patches to fix acidental 64-bit to 32-bit truncations in the register
handling code.

For the full patch set, see:

https://git.linaro.org/people/daniel.thompson/openocd.git/shortlog/refs/heads/hacking/armv8_gdb_support
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