Micro-optimize Base.fill.

[maleadt]

No description provided.

[codecov]

Codecov Report

Merging #339 into master will decrease coverage by 0.00%.
The diff coverage is 75.00%.

@@            Coverage Diff             @@
##           master     #339      +/-   ##
==========================================
- Coverage   78.66%   78.66%   -0.01%     
==========================================
  Files         158      158              
  Lines        8780     8783       +3     
==========================================
+ Hits         6907     6909       +2     
- Misses       1873     1874       +1     

Impacted Files	Coverage Δ
src/array.jl	91.70% <75.00%> (-0.40%)	⬇️

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