rocPRIM 2.12.0 for ROCm 5.4.0

Changed

• device_partition, device_unique, and device_reduce_by_key now support problem
  sizes larger than 2^32 items.

Removed

• block_sort::sort() overload for keys and values with a dynamic size. This overload was documented but the
  implementation is missing. To avoid further confusion the documentation is removed until a decision is made on
  implementing the function.

Fixed

• Fixed the compilation failure in device_merge if the two key iterators don't match.