Fix bounds checking with GPU views.

[maleadt]

Fixes JuliaGPU/GPUArrays.jl#313

[codecov]

Codecov Report

Merging #404 into master will not change coverage.
The diff coverage is 100.00%.

@@           Coverage Diff           @@
##           master     #404   +/-   ##
=======================================
  Coverage   78.86%   78.86%           
=======================================
  Files         165      165           
  Lines        8749     8749           
=======================================
  Hits         6900     6900           
  Misses       1849     1849           

Impacted Files	Coverage Δ
test/array.jl	0.00% <ø> (ø)
src/subarray.jl	86.36% <100.00%> (ø)

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