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vtkIOSSReader: performance issues

Utkarsh Ayachit requested to merge utkarsh.ayachit/vtk:ioss-reader-performance-fixes into master

Attempting to address paraview/paraview#21172 (closed). Performance analysis indicated that Ioss::Region::get_min_timestep/get_max_timestep calls were the bottlenecks. Just caching the time/state values and then reusing them seems to improve the performance of the reader considerably.

Backport: paraview/release

Edited by Utkarsh Ayachit

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