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ILU for SIMD types

Nils-Arne Dreier requested to merge ILU_for_vector_types into master

This MR adapts the ILU for SIMD type valued matrices. This includes two changes:

  1. Use Simd::lane(0, ...) for storing the generation number, and use abs to compute the real value, since it is defined also for vectorclass types. As we are storing only real values at this point that doesnt make a difference.
  2. Use the same allocator in the CRS matrix as in the system matrix.

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