[mlir] Fix assert in TestWrittenToPass for unreachable private functions (#186162) TestSparseBackwardDataFlowAnalysis::TestWrittenToPass asserted that the WrittenTo sparse lattice was always computed for tagged operands and results. This assertion fires when analyzing a private function that is never called from anywhere: in interprocedural mode the backward data flow solver does not visit such dead code, leaving the lattice state uninitialized. Replace the assertions with null checks that print "<not computed>" instead, matching the approach used in TestDenseForwardDataFlowAnalysis for the analogous dense forward case. Fixes #128339 Assisted-by: Claude Code
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