Fastmath improvements

[maleadt]

Fixes #1352

[codecov]

Codecov Report

Merging #1356 (6cd89af) into master (00955dd) will decrease coverage by 0.08%.
The diff coverage is n/a.

@@            Coverage Diff             @@
##           master    #1356      +/-   ##
==========================================
- Coverage   78.94%   78.86%   -0.09%     
==========================================
  Files         119      119              
  Lines        8686     8686              
==========================================
- Hits         6857     6850       -7     
- Misses       1829     1836       +7     

Impacted Files	Coverage Δ
src/compiler/exceptions.jl	94.11% <0.00%> (-5.89%)	⬇️
lib/cudadrv/stream.jl	93.54% <0.00%> (-1.62%)	⬇️
lib/cudadrv/state.jl	79.54% <0.00%> (-1.14%)	⬇️
src/pool.jl	76.72% <0.00%> (-0.87%)	⬇️
lib/cudadrv/memory.jl	81.44% <0.00%> (-0.35%)	⬇️

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