Ifpack2 BlockRelaxation: Validation of inputs

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@trilinos/ifpack2

I tried to verify that the test changes in PR #12678 would have caught the issue in #12661.

• It seems that this combination of container and block relaxation is not hooked up in the solver factory.
• I tried to set up a test case using a block CRS matrix the preconditioner setup crashed due to an out-of-bounds error in a view:

  View bounds error of view btdm.A_colindsub ( 6 < 5 )
  

  My guess is that I passed in bad inputs somehow, but I guess this means that there is a gap in the input validation.

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This issue was closed due to inactivity for 395 days.