Small allocator improvements

[maleadt]

No description provided.

[codecov]

Codecov Report

Merging #1068 (6e9522f) into master (46f6109) will increase coverage by 0.01%.
The diff coverage is 84.00%.

@@            Coverage Diff             @@
##           master    #1068      +/-   ##
==========================================
+ Coverage   80.05%   80.07%   +0.01%     
==========================================
  Files         118      118              
  Lines        7657     7657              
==========================================
+ Hits         6130     6131       +1     
+ Misses       1527     1526       -1     

Impacted Files	Coverage Δ
src/pool.jl	77.13% <55.55%> (ø)
lib/cudadrv/devices.jl	100.00% <100.00%> (ø)
lib/cudadrv/memory.jl	87.50% <100.00%> (-0.10%)	⬇️
lib/cudadrv/module/global.jl	86.95% <100.00%> (ø)
src/array.jl	92.47% <100.00%> (ø)
lib/cusparse/level3.jl	75.00% <0.00%> (+0.65%)	⬆️

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