- Add a new macro DROP_GIANT_NOSWITCH() that is similar to DROP_GIANT()

  except that it uses the MTX_NOSWITCH flag while it releases Giant via
  mtx_exit().
- Add a mtx_recursed() primitive.  This primitive should only be used on
  a mutex owned by the current process.  It will return non-zero if the
  mutex is recursively owned, or zero otherwise.
- Add two new flags MA_RECURSED and MA_NOTRECURSED that can be used in
  conjuction with MA_OWNED to control the assertion checked by mtx_assert().
- Fix some of the KTR tracepoint strings to use %p when displaying the lock
  field of a mutex, which is a uintptr_t.

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