Cycles: Fix possible race condition when generating Beckmann table

Two issues here:

- Checking table size to be non-zero is not a proper way to go here. This is
  because we first resize the table and then fill it in. So it was possible that
  non-initialized table was used.

  Trickery with using temporary memory and then doing table.swap() might work,
  but we can not guarantee that table size will be set after the data pointer.

- Mutex guard was useless, because every thread was using own mutex. Need to
  make mutex guard static so all threads are using same mutex.

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