Ifpack2::Experimental::RBILUK: Only instantiate for MatrixType=RowMatrix
Created by: mhoemmen
@trilinos/ifpack2 Convention for Ifpack2 is that the MatrixType template parameter should always be a Tpetra::RowMatrix specialization. This makes ETI easier, and avoids redundant instantiations that waste build time and space. BlockCrsMatrix inherits from RowMatrix, so we only need to instantiate Ifpack2::Experimental::RBILUK for MatrixType = RowMatrix. Right now, Ifpack2 instantiates for both classes.