Support wrapping an Array with a CuArray without HMM.

[maleadt]

By page-locking/registering the memory with the CUDA driver.

[codecov]

Codecov Report

Attention: 1 lines in your changes are missing coverage. Please review.

Comparison is base (12f9d04) 72.21% compared to head (ebdd7a3) 72.39%.
Report is 1 commits behind head on master.

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #2156      +/-   ##
==========================================
+ Coverage   72.21%   72.39%   +0.17%     
==========================================
  Files         159      159              
  Lines       14505    14511       +6     
==========================================
+ Hits        10475    10505      +30     
+ Misses       4030     4006      -24     

Files	Coverage Δ
lib/cudadrv/memory.jl	79.19% <100.00%> (-0.07%)	⬇️
src/compiler/execution.jl	87.40% <100.00%> (+0.48%)	⬆️
src/array.jl	86.88% <88.88%> (+6.39%)	⬆️

... and 1 file with indirect coverage changes

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