Adding stream update for inplace complex FFT

[ovanvincq]

Fixes #1268

[maleadt]

Thanks! Since you had a compact reproducer, maybe add that as a test?

[codecov]

Codecov Report

Merging #1269 (33aa453) into master (9636915) will increase coverage by 0.06%.
The diff coverage is 100.00%.

@@            Coverage Diff             @@
##           master    #1269      +/-   ##
==========================================
+ Coverage   78.95%   79.01%   +0.06%     
==========================================
  Files         119      119              
  Lines        8544     8627      +83     
==========================================
+ Hits         6746     6817      +71     
- Misses       1798     1810      +12     

Impacted Files	Coverage Δ
lib/cufft/fft.jl	89.16% <100.00%> (+1.99%)	⬆️
lib/utils/threading.jl	74.07% <0.00%> (-1.93%)	⬇️
src/utilities.jl	78.46% <0.00%> (-1.87%)	⬇️
lib/cudnn/CUDNN.jl	74.60% <0.00%> (-1.21%)	⬇️
lib/cudnn/convolution.jl	67.05% <0.00%> (-0.80%)	⬇️
lib/cudnn/rnn.jl	73.04% <0.00%> (-0.65%)	⬇️
src/pool.jl	76.79% <0.00%> (-0.60%)	⬇️
lib/cublas/CUBLAS.jl	76.57% <0.00%> (-0.49%)	⬇️
src/state.jl	79.09% <0.00%> (-0.45%)	⬇️
src/sorting.jl	23.91% <0.00%> (-0.09%)	⬇️
... and 21 more

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