Comment out @debug statements

[andreasnoack]

Profiling reveals that there is a lot of overhead from them even at the default logging level. Hopefully that will improve over time. For now, users would have to uncomment these lines before debugging.

As an example

Current master

julia> @btime GenericLinearAlgebra._eigen!(S) setup = (S = LinearAlgebra.SymTridiagonal(ones(100), 0.2*ones(99)));
  505.083 μs (12 allocations: 159.12 KiB)

This PR

julia> @btime GenericLinearAlgebra._eigen!(S) setup = (S = LinearAlgebra.SymTridiagonal(ones(100), 0.2*ones(99)));
  153.222 μs (12 allocations: 159.12 KiB)

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 91.80%. Comparing base (55a38e6) to head (21be7de).
Report is 1 commits behind head on master.

Additional details and impacted files

@@            Coverage Diff             @@
##           master     #150      +/-   ##
==========================================
- Coverage   91.94%   91.80%   -0.15%     
==========================================
  Files          10       10              
  Lines        1577     1549      -28     
==========================================
- Hits         1450     1422      -28     
  Misses        127      127              

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