fortran_vec: Fix instances of method chaining that may cause dangling pointer. * libinterp/corefcn/quandcc.cc (Fquadcc): Replace method chaining with a separate line for NDArray object to avoid going out of scope. * libinterp/corefcn/__ilu__.cc (F__iluc__): Obtain RowVector and ColumnVector objects in separate line to remain in scope. * libinterp/corefcn/__ichol__.cc (F__icholt__): Obtain RowVector object in separate line to remain in scope. For more details: https://octave.discourse.group/t/3132

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