Introduce a macro for marking multiple functions as device-only.

[maleadt]

Use it to mark the indexing functions like that. Makes #1116 error instead of segfault.

[codecov]

Codecov Report

Merging #1117 (faa3387) into master (b04eb2f) will decrease coverage by 0.01%.
The diff coverage is n/a.

@@            Coverage Diff             @@
##           master    #1117      +/-   ##
==========================================
- Coverage   79.45%   79.43%   -0.02%     
==========================================
  Files         118      118              
  Lines        7920     7996      +76     
==========================================
+ Hits         6293     6352      +59     
- Misses       1627     1644      +17     

Impacted Files	Coverage Δ
lib/utils/threading.jl	74.07% <0.00%> (-1.93%)	⬇️
lib/cudnn/CUDNN.jl	75.40% <0.00%> (-1.26%)	⬇️
src/utilities.jl	88.70% <0.00%> (-0.95%)	⬇️
lib/cudnn/convolution.jl	67.05% <0.00%> (-0.80%)	⬇️
lib/cudnn/rnn.jl	71.30% <0.00%> (-0.63%)	⬇️
lib/cublas/CUBLAS.jl	76.57% <0.00%> (-0.49%)	⬇️
src/state.jl	77.97% <0.00%> (-0.47%)	⬇️
src/sorting.jl	21.00% <0.00%> (-0.30%)	⬇️
lib/cufft/fft.jl	83.69% <0.00%> (-0.19%)	⬇️
src/pool.jl	75.94% <0.00%> (-0.14%)	⬇️
... and 18 more

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