Specialize triu! and tril! for adj/trans

[jishnub]

We may forward the operation to the parent, which would usually ensure that the loops are cache-friendly.

[dkarrasch]

Any performance numbers?

[jishnub]

julia> @btime triu!($A') setup=(A=rand(1000,1000));
  571.064 μs (0 allocations: 0 bytes) # nightly
  122.155 μs (0 allocations: 0 bytes) # this PR

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 93.82%. Comparing base (3537c3a) to head (0149ac4).
⚠️ Report is 18 commits behind head on master.

Additional details and impacted files

@@           Coverage Diff           @@
##           master    #1385   +/-   ##
=======================================
  Coverage   93.81%   93.82%           
=======================================
  Files          34       34           
  Lines       15718    15720    +2     
=======================================
+ Hits        14746    14749    +3     
+ Misses        972      971    -1     

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