Materialize only once in nullspace return value
#47340
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This reduces allocations, but doesn't really change performance to any significant degree. ```julia julia> A = ones(1000, 1000); julia> @Btime nullspace($A); 375.469 ms (15 allocations: 61.14 MiB) # master 374.243 ms (13 allocations: 53.52 MiB) # PR ``` This might help when working with large arrays.
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This reduces allocations, but doesn't really impact performance.
This might help when working with large low-rank matrices.