message: Bugfix in Bitset for 64-bit axom::IndexType
  The Array constructor needs to use axom::IndexType for its size and capacity parameters.
  I reverted my switch to the local `Index` type, which triggered static_asserts in Array.
diff: @@ -117,7 +117,7 @@ public:
  using Word = axom::uint64;
  // TODO: update using a policy
  - using ArrayType = axom::Array<Word>;
  + using ArrayType = axom::Array<Word, 1>;
  static constexpr Index npos = -2;
  static constexpr int BitsPerWord =
  @@ -146,7 +146,8 @@ public:
  "slam::BitSet must be initialized with a non-zero number of bits");
  m_numBits = axom::utilities::max(numBits, 0);
  - Index numWords = (m_numBits == 0) ? 1 : 1 + (m_numBits - 1) / BitsPerWord;
  + axom::IndexType numWords =
  + (m_numBits == 0) ? 1 : 1 + (m_numBits - 1) / BitsPerWord;
  m_data = ArrayType(numWords, numWords, allocatorID);
  m_data.fill(0);
  