Optimize expression range allocs by using a pool

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[codecov-commenter]

Codecov Report

Merging #92 (24cd89c) into master (25df2c4) will increase coverage by 0.07%. The diff coverage is 100.00%.

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@@            Coverage Diff             @@
##           master      #92      +/-   ##
==========================================
+ Coverage   89.52%   89.59%   +0.07%     
==========================================
  Files         103      104       +1     
  Lines        5201     5240      +39     
==========================================
+ Hits         4656     4695      +39     
  Misses        416      416              
  Partials      129      129              

Impacted Files	Coverage Δ
pkg/slicepool/intpool.go	100.00% <ø> (ø)
pkg/expressions/stdlib/funcsRange.go	92.30% <100.00%> (ø)
pkg/slicepool/objpool.go	100.00% <100.00%> (ø)