Rework factorizations

[maleadt]

Use improvements from JuliaLang/julia#42594. Will supersede #1194.

[codecov]

Codecov Report

Merging #1449 (da14248) into master (3f86a0a) will decrease coverage by 0.51%.
The diff coverage is 87.16%.

@@            Coverage Diff             @@
##           master    #1449      +/-   ##
==========================================
- Coverage   77.81%   77.30%   -0.52%     
==========================================
  Files         121      120       -1     
  Lines        9194     9225      +31     
==========================================
- Hits         7154     7131      -23     
- Misses       2040     2094      +54     

Impacted Files	Coverage Δ
lib/cublas/CUBLAS.jl	50.89% <ø> (-25.90%)	⬇️
src/CUDA.jl	100.00% <ø> (ø)
lib/cublas/linalg.jl	80.59% <75.00%> (-1.23%)	⬇️
lib/cusolver/linalg.jl	88.35% <88.37%> (-0.71%)	⬇️
lib/cusolver/dense.jl	99.43% <100.00%> (+3.21%)	⬆️
lib/cusolver/multigpu.jl	98.47% <100.00%> (+2.14%)	⬆️
lib/cudnn/CUDNN.jl	40.00% <0.00%> (-35.81%)	⬇️
src/utilities.jl	68.91% <0.00%> (-4.06%)	⬇️
lib/cudadrv/CUDAdrv.jl	51.66% <0.00%> (-3.34%)	⬇️
... and 3 more

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