One year checkpoint and Thread Sanitizer update

The past year has been started with bugfixes and the development of
regression tests for ptrace(2) and related kernel features, as well as
the continuation of bringing LLDB support and LLVM sanitizers (ASan +
UBsan and partial TSan + Msan) to NetBSD.
My plan for the next year is to finish implementing TSan and MSan
support, followed by a long run of bug fixes for LLDB, ptrace(2), and
other related kernel subsystems

Plans for the next milestone

The general goals are to finish TSan and MSan and switch back to LLDB
debugging. I plan to verify the impact of the TSan bootstrap
initialization on the observed crashes and research the remaining failures.

This work was sponsored by The NetBSD Foundation.

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