@propagate_inbounds in indexing a BandSlice

[jishnub]

On master

julia> A = zeros(10,10);

julia> r = first(to_indices(A, (band(1),)));

julia> @btime @inbounds $r[1:end];
  19.346 ns (0 allocations: 0 bytes)

After this PR,

julia> @btime @inbounds $r[1:end];
  13.774 ns (0 allocations: 0 bytes)

[codecov]

Codecov Report

Patch coverage: 100.00% and no project coverage change.

Comparison is base (c1582fd) 89.39% compared to head (9aaaab6) 89.39%.

Additional details and impacted files

@@           Coverage Diff           @@
##           master     #377   +/-   ##
=======================================
  Coverage   89.39%   89.39%           
=======================================
  Files          24       24           
  Lines        3479     3479           
=======================================
  Hits         3110     3110           
  Misses        369      369           

Impacted Files	Coverage Δ
src/generic/Band.jl	83.95% <100.00%> (ø)

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