Tpetra::CrsMatrix: Add getLocalRowView overload that returns raw pointers
Created by: mhoemmen
@trilinos/tpetra This will help fix #449 while still letting us use thread parallelism. The issue is that Teuchos::ArrayView is not thread-safe in a debug build, due to RCP reference counting (e.g., ArrayView iterators are ArrayRCP iterators in a debug build). Thus, in order to access CrsMatrix entries safely in a thread-parallel context, we need methods that carefully avoid anything that would create a new Teuchos::Array* instance or iterator. (Teuchos::Array* access (operator[]) is fine.)