Fix stack overflow w/ OneTo axes

[dlfivefifty]

This fixes the bug in SciML/DiffEqOperators.jl#253 (comment)

[codecov]

Codecov Report

Merging #74 into master will not change coverage.
The diff coverage is 100.00%.

@@           Coverage Diff           @@
##           master      #74   +/-   ##
=======================================
  Coverage   80.50%   80.50%           
=======================================
  Files          10       10           
  Lines         800      800           
=======================================
  Hits          644      644           
  Misses        156      156           

Impacted Files	Coverage Δ
src/BlockBandedMatrices.jl	33.33% <ø> (ø)
src/blockskylineqr.jl	96.42% <ø> (ø)
src/BandedBlockBandedMatrix.jl	85.45% <100.00%> (ø)

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