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Continuation of signal semantics improvements

Over the past month I've finally managed to correct masking semantics of
crash signals (SIGSEGV, SIGTRAP, SIGILL, SIGFPE, SIGBUS). Additionally
I've fixed masking semantics in forks(2) and vforks(2) (they trigger a
crash signal SIGTRAP). There is remaining work in signal semantics for
other types of events (mainly thread related). The coverage of signal
code in ptrace(2) regression tests keeps continuously incrementing.

Plan for the next milestone

Keep preparing kernel fixes and after thorough verification applying
them to the mainline distribution.

This work was sponsored by The NetBSD Foundation.

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