Fix some mul! ambiguities, and dispatch more to CUBLAS.

[maleadt]

No description provided.

[codecov]

Codecov Report

Merging #214 into master will increase coverage by 0.14%.
The diff coverage is 100.00%.

@@            Coverage Diff             @@
##           master     #214      +/-   ##
==========================================
+ Coverage   80.83%   80.97%   +0.14%     
==========================================
  Files         143      143              
  Lines        9444     9456      +12     
==========================================
+ Hits         7634     7657      +23     
+ Misses       1810     1799      -11     

Impacted Files	Coverage Δ
lib/cublas/linalg.jl	89.04% <100.00%> (+0.98%)	⬆️
src/memory.jl	79.18% <0.00%> (+1.52%)	⬆️
deps/bindeps.jl	82.00% <0.00%> (+2.00%)	⬆️
lib/cuda/occupancy.jl	96.00% <0.00%> (+20.00%)	⬆️

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