Initial ARMv8-M MPU support. #225
Merged
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The v8-M MPU is entirely different from, and incompatible with, the
earlier PMSA MPU. And so this commit does two things:
Makes the old RegisterBlock depend on armv6m (for M0+) and armv7m.
Defines a new RegisterBlock containing the right layout for v8m.
The hack for documenting fields by opting in x86-64 means the v8m
version won't appear in the docs.