There is a bunch of places in the kernel entry points where we don't

hold the kernel lock, but still need call one function that needs it.

Instead of grabbing the lock all over the place, move the locks into
the affected functions: trapsignal, scdebug*, ktrsyscall, ktrsysret,
systrace_redirect and ADDUPROF. In the cases we already hold the biglock
we'll just recurse.

kettenis@, beck@ ok

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