Perform pool operations in the correct context.

[maleadt]

Fixes #731

[codecov]

Codecov Report

Merging #732 (fba4389) into master (a34e69e) will decrease coverage by 0.02%.
The diff coverage is 100.00%.

@@            Coverage Diff             @@
##           master     #732      +/-   ##
==========================================
- Coverage   79.91%   79.89%   -0.03%     
==========================================
  Files         122      122              
  Lines        7405     7410       +5     
==========================================
+ Hits         5918     5920       +2     
- Misses       1487     1490       +3     

Impacted Files	Coverage Δ
src/array.jl	89.95% <100.00%> (+0.18%)	⬆️
src/pool.jl	73.07% <0.00%> (-0.77%)	⬇️
lib/cufft/fft.jl	85.03% <0.00%> (-0.40%)	⬇️
lib/cublas/wrappers.jl	90.34% <0.00%> (+0.01%)	⬆️

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