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Add support for BitFields.

Allison Vacanti requested to merge allisonvacanti/vtk-m:bitfields into master

See discussion in #341 (closed). This MR continues !1526 (closed).

BitFields are:

  • Stored in memory using a contiguous buffer of bits.
  • Accessible via portals, a la ArrayHandle.
  • Portals operate on individual bits or words.
  • Operations may be atomic for safe use from concurrent kernels.

The new BitFieldToUnorderedSet device algorithm produces an ArrayHandle containing the indices of all set bits, in no particular order.

The new AtomicInterface classes provide an abstraction into bitwise atomic operations across control and execution environments and are used to implement the BitPortals.

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